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• I just recursively chmod'd everything under / to 750. Any tips?

  - by Ouairz

  I won't be the first and I won't be the last, I suppose. While playing around with the find command, I made a whoops and it would appear that instead of changing the permissions of the ~/web directory to 750, it changed the permissions of the entire filesystem (/) to 750, however I'm not certain, but any attempt to investigate is thwarted by Permission denied messages. For everything. This was the offending command: sudo find ~/web . type d -exec chmod 750 {} If I'm not mistaken, the Ubuntu team disabled root logins as a safety precaution so I'm out of ideas. I'm (obviously) a total newbie when it comes to file permissions so I was wondering if anyone had some good or even some bad advice to share. I've mentally prepped myself to losing everything on the computer which is only of mild consequence, since I have backups, but I did do a bit of work on this box over the week and it would be a shame to lose it all due to a boneheaded mistake. If you are reading this message, ask yourself, have you backed up any of your work recently? Thanks in advance for any insights. Feel free to scold me for using sudo carelessly

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• What kind of permission is this? (Groups+Roles)

  - by Jorge

  I'm starting to need an access control for roles in my app. I don't know much of this, but I understand how vBulletin works: I create groups, then give permissions to groups. I think that what I need is the Role Bases Access Control (RBAC) , but i'm not sure, because I need groups to give permissions instead of single users (Maybe it's not that complicated to achieve). Example of what I'm thinking: Given a post: Editor's Group has permission to view it before it's published. Editor's Group has permission to edit its content. Public Group (Default) has not permission to view it before it's published. Admin Group has permission to delete the post. So basically I wan't orientation about if RBAC is what I need. And also, how would it be good to store group membership in a user, for example, would be good to have: ID NAME PASSWORD GROUPS (1, MyName, MyPassword, 1/2/3/4/5) and explode it via PHP or one registry for every Group membership in a table named permissions, example: USERID, USERGROUP values (1, 1), (1, 2) Maybe should be the second way because of the formal norms but I didn't study yet Databases 1 at college.

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• .NET: IOException for permissions when creating new file?

  - by Rosarch

  I am trying to create a new file and write XML to it: FileStream output = File.Create(Path.Combine(PATH_TO_DATA_DIR, fileName)); The argument evaluates to: C:\path\to\Data\test.xml The exception is: The process cannot access the file 'C:\path\to\Data\test.xml' because it is being used by another process. What am I doing wrong here? UPDATE: This code throws the same exception: StreamWriter writer = new StreamWriter(Path.Combine(PATH_TO_DATA_DIR, fileName)); UPDATE 2: The file I am trying to create does not exist in the file system. So how can be it in use?

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• "Unable to open file", when the program tries to open file in /proc

  - by tristartom

  Hi, I try to read file /proc/'pid'/status, using c program. The code is as follows, and even I use sudo to run it, the prompt still keeps throwing "Unable to open file". Please let me know if you have any ideas on how to fix this. thanks Richard ... int main (int argc, char* argv[]) { string line; char* fileLoc; if(argc != 2) { cout << "a.out file_path" << endl; fileLoc = "/proc/net/dev"; } else { sprintf(fileLoc, "/proc/%d/status", atoi(argv[1])); } cout<< fileLoc << endl; ifstream myfile (fileLoc); if (myfile.is_open()) { while (! myfile.eof() ) { getline (myfile,line); cout << line << endl; } myfile.close(); } else cout << "Unable to open file"; return 0; }

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• jQuery: get the file name selected from <input type="file" />

  - by ConNen

  This code should work in IE (don't even test it in Firefox), but it doesn't. What I want is to display the name of the attached file. Any help? <html> <head> <title>example</title> <script type="text/javascript" src="../js/jquery.js"></script> <script type="text/javascript"> $(document).ready( function(){ $("#attach").after("<input id='fakeAttach' type='button' value='attach a file' />"); $("#fakeAttach").click(function() { $("#attach").click(); $("#maxSize").after("<div id='temporary'><span id='attachedFile'></span><input id='remove' type='button' value='remove' /></div>"); $('#attach').change(function(){ $("#fakeAttach").attr("disabled","disabled"); $("#attachedFile").html($(this).val()); }); $("#remove").click(function(e){ e.preventDefault(); $("#attach").replaceWith($("#attach").clone()); $("#fakeAttach").attr("disabled",""); $("#temporary").remove(); }); }) }); </script> </head> <body> <input id="attach" type="file" /><span id="maxSize">(less than 1MB)</span> </body> </html>

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• Tail the filename, not the file

  - by Craig Walker

  In UNIX (OS X BSD to be precise), I have a "tail -f" command on a log file. From time to time I want to delete this log file so I can more easily review it in my text editor. I delete the file, and then my program recreates it after new activity. However, my tail command (and anything else that was watching the old log file) doesn't update; it's still watching the old, deleted log file. I think I understand why this is (file names simply being pointers to blocks of file data). I'd like to know how I can work around this. Ideally, my tail command (and anything else I point to the file) would be able to read the data from the new file when the file name has been deleted and recreated. How would I do this?

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• rsync to EC2: Identity file not accessible

  - by Richard

  I'm trying to rsync a file over to my EC2 instance: rsync -Paz --rsh "ssh -i ~/.ssh/myfile.pem" --rsync-path "sudo rsync" file.pdf [email protected]:/home/ubuntu/ This gives the following error message: Warning: Identity file ~/.ssh/myfile.pem not accessible: No such file or directory. [email protected]'s password: The pem file is definitely located at the path ~/.ssh/myfile.pem, though: vi ~/.ssh/myfile.pem shows me the file. If I remove the remote path from the very end of the rsync command: rsync -Paz --rsh "ssh -i ~/.ssh/myfile.pem" --rsync-path "sudo rsync" file.pdf [email protected] Then the command appears to work... building file list ... 1 file to consider file.pdf 41985 100% 8.79MB/s 0:00:00 (xfer#1, to-check=0/1) sent 41795 bytes received 42 bytes 83674.00 bytes/sec total size is 41985 speedup is 1.00 ...but when I go to the remote server, nothing has actually been transferred. What am I doing wrong?

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• Viewing file: protocol requests made from a swf

  - by Erik Vold

  I've got a swf file in a index.html file, the swf is basically loading images, but it requests a xml file which details where the image/asset files are located. Now the index file (which is just html, js, and css) works (ie: the swf file is working) when used on this url: http://localhost:8500/core/index.html which I'm able to do with Coldfusion 8 single server development environment. But when I access the file directly with this url: file:///C:/ColdFusion8/wwwroot/core/index.html the swf file does not work. So I'm guessing that the swf is having trouble locating the files that it needs. The problem is I have no idea what file urls it is try to access atm, and both Firebug and Fiddler are not able to inform me what requests are made on the file: protocol. So is there another tool that I can use?

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• How can I make a permanently updated copy of a file in a different place to the original file?

  - by Mark

  I use two computers, a Linux one for coding and building and a Windows one which has the programming application to load the built program onto the hardware. Both computers have access to a network drive which I use to pass the files from Linux to Windows. My problem is, that every time I build I have to copy the files from where the are created to the network drive. How can I make some sort of file in the network drive on Ubuntu that always mirrors the file which is built in the different location, like a pointer? Thanks!

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• Cannot access system after deleting passwd file

  - by joao rodrigo leao

  I was trying to change my user name and also my /home/username and my system started to crash. I deleted the passwd file but I had a backup named passwd_bkp. I tried to rename this passwd_bkp as passwd and it did not work. No commands were being executed... I was in a terminal window. I re-started my system and now I cannot login. The GRub loads two options: Linux and recovery mode. I tried to open a sessions as root but it says the file system is corrupted. I cannot access my files. Did I lose all my files?

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• How to give my user permission to add/edit files on local apache server? [duplicate]

  - by Logan

  Possible Duplicate: How to make Apache run as current user I'm setting up my local test server again, and I seem to have forgotten how to successfully set up the LAMP server. I have installed LAMP server via tasksel command and I have configured the /var/www directory according to a guide I've found: After the lamp server installation you will need write permissions to the /var/www directory. Follow these steps to configure permissions. Add your user to the www-data group sudo usermod -a -G www-data <your user name> now add the /var/www folder to the www-data group sudo chgrp -R www-data /var/www now give write permissions to the www-data group sudo chmod -R g+w /var/www So logan user is now part of www-data group and the file/folder permissions look like the output below: logan@computer:/var/www$ ls -lart total 172 -rw-r--r-- 1 www-data www-data 1997 Oct 23 2010 wp-links-opml.php -rw-r--r-- 1 www-data www-data 3177 Nov 1 2010 wp-config-sample.php -rw-r--r-- 1 www-data www-data 3700 Jan 8 2012 wp-trackback.php -rw-r--r-- 1 www-data www-data 271 Jan 8 2012 wp-blog-header.php -rw-r--r-- 1 www-data www-data 395 Jan 8 2012 index.php -rw-r--r-- 1 www-data www-data 3522 Apr 10 2012 wp-comments-post.php -rw-r--r-- 1 www-data www-data 19929 May 6 2012 license.txt -rw-r--r-- 1 www-data www-data 18219 Sep 11 08:27 wp-signup.php -rw-r--r-- 1 www-data www-data 2719 Sep 11 16:11 xmlrpc.php -rw-r--r-- 1 www-data www-data 2718 Sep 23 12:57 wp-cron.php -rw-r--r-- 1 www-data www-data 7723 Sep 25 01:26 wp-mail.php -rw-r--r-- 1 www-data www-data 2408 Oct 26 15:40 wp-load.php -rw-r--r-- 1 www-data www-data 4663 Nov 17 10:11 wp-activate.php -rw-r--r-- 1 www-data www-data 9899 Nov 22 04:52 wp-settings.php -rw-r--r-- 1 www-data www-data 9175 Nov 29 19:57 readme.html -rw-r--r-- 1 www-data www-data 29310 Nov 30 08:40 wp-login.php drwxr-xr-x 14 root root 4096 Dec 24 17:41 .. drwx------ 9 www-data www-data 4096 Dec 26 16:11 wp-admin drwx------ 9 www-data www-data 4096 Dec 26 16:11 wp-includes -rw-rw-rw- 1 www-data www-data 3448 Dec 26 16:14 wp-config.php drwxrwxr-x 5 www-data www-data 4096 Dec 26 16:14 . drwx------ 6 www-data www-data 4096 Dec 26 16:19 wp-content Things work perfectly at http://localhost, I can view the website fine. The thing with this is that I will be working on a plugin for wordpress and I don't want to deal with separate owners under www directory to create or modify files/folders. When I give my user the ownership of /var/www recursively as logan:www-data I can create/modify files but cannot view the http://localhost. I get a Forbidden error. I'm assuming that this is because of the Apache's configuration? Which one is healthier or easier considering this is just a local test website, configuring apache to give user logan to view website and chmod /var/www logan:logan so that I can create files etc. without any sudo commands; or is it easier to configure user groups to get www-data user to act like my logan user? (Idk how that's possible, maybe putting www-data user under logan group?) Please shed some light to this subject. All I want is to be able to create/modifiy files under my user, and yet to be able to successfully view http://localhost I appreciate the help!

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• Run a .sql script file in C#

  - by SAMIR BHOGAYTA

  using System.Data.SqlClient; using System.IO; using Microsoft.SqlServer.Management.Common; using Microsoft.SqlServer.Management.Smo; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { string sqlConnectionString = "Data Source=(local);Initial Catalog=AdventureWorks;Integrated Security=True"; FileInfo file = new FileInfo("C:\\myscript.sql"); string script = file.OpenText().ReadToEnd(); SqlConnection conn = new SqlConnection(sqlConnectionString); Server server = new Server(new ServerConnection(conn)); server.ConnectionContext.ExecuteNonQuery(script); } } }

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• Custom extensible file format for 2d tiled maps

  - by Christian Ivicevic

  I have implemented much of my game logic right now, but still create my maps with nasty for-loops on-the-fly to be able to work with something. Now I wanted to move on and to do some research on how to (un)serialize this data. (I do not search for a map editor - I am speaking of the map file itself) For now I am looking for suggestions and resources, how to implement a custom file format for my maps which should provide the following functionality (based on MoSCoW method): Must have Extensibility and backward compatibility Handling of different layers Metadata on whether a tile is solid or can be passed through Special serialization of entities/triggers with associated properties/metadata Could have Some kind of inclusion of the tileset to prevent having scattered files/tilesets I am developing with C++ (using SDL) and targetting only Windows. Any useful help, tips, suggestions, ... would be appreciated!

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• Considerations when designing a file type

  - by AndyBursh

  I'm about to start writing a process for saving some data structure from code in to a file of some proprietary, as-yet-undefined type. However, I've never designed a file type or structure before. Are there any things, generally speaking, that I should consider before starting my design? Are there any accepted good practices here? Bad practices I should avoid? Any absolute do's and don'ts? Can anybody recommend any good reading on this topic?

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• Upgrading MySQL causes errors

  - by user1032531

  I am running Centos 5.8 (Linux 2.6.18-308.13.1.el5 on x86_64), and wish to upgrade MySQL version 5.0.95. I am using a tutorial found at http://www.if-not-true-then-false.com/2010/install-mysql-on-fedora-centos-red-hat-rhel/. When I get to the following, I get the host of errors. Seems to have something to do with going from 386 to 86x64. Can anyone help? Thanks yum --enablerepo=remi,remi-test update mysql mysql-server Transaction Check Error: file /etc/my.cnf from install of mysql50-5.0.96-2.ius.el5.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/info/mysql.info.gz from install of mysql50-5.0.96-2.ius.el5.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysql.1.gz from install of mysql50-5.0.96-2.ius.el5.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqlaccess.1.gz from install of mysql50-5.0.96-2.ius.el5.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqladmin.1.gz from install of mysql50-5.0.96-2.ius.el5.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqldump.1.gz from install of mysql50-5.0.96-2.ius.el5.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqlshow.1.gz from install of mysql50-5.0.96-2.ius.el5.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /etc/my.cnf from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/charsets/Index.xml from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/charsets/cp1250.xml from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/charsets/cp1251.xml from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/czech/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/danish/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/dutch/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/english/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/estonian/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/french/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/german/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/greek/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/hungarian/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/italian/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/japanese/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/korean/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/norwegian-ny/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/norwegian/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/polish/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/portuguese/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/romanian/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/russian/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/serbian/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/slovak/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/spanish/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/swedish/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/mysql/ukrainian/errmsg.sys from install of mysql-libs-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/bin/mysqlaccess from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/my_print_defaults.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysql.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysql_config.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysql_find_rows.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysql_waitpid.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqlaccess.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqladmin.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqldump.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386 file /usr/share/man/man1/mysqlshow.1.gz from install of mysql-5.5.28-1.el5.remi.x86_64 conflicts with file from package mysql-5.0.95-1.el5_7.1.i386

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• System.IO.IOException: file used by another process

  - by Srodriguez

  Dear all, I've been working in this small piece of code that seems trivial but still i cannot really see where is the problem. My functions does a pretty simple thing. Opens a file, copy its contents, replace a string inside and copy it back to the original file (a simple search and replace inside a text file then). I didn't really know how to do that as I'm adding lines to the original file, so i just create a copy of the file, (file.temp) copy also a backup (file.temp) then delete the original file(file) and copy the file.temp to file. I get an exception while doing the delete of the file. Here is the sample code: private static bool modifyFile(FileInfo file, string extractedMethod, string modifiedMethod) { Boolean result = false; FileStream fs = new FileStream(file.FullName + ".tmp", FileMode.Create, FileAccess.Write); StreamWriter sw = new StreamWriter(fs); StreamReader streamreader = file.OpenText(); String originalPath = file.FullName; string input = streamreader.ReadToEnd(); Console.WriteLine("input : {0}", input); String tempString = input.Replace(extractedMethod, modifiedMethod); Console.WriteLine("replaced String {0}", tempString); try { sw.Write(tempString); sw.Flush(); sw.Close(); sw.Dispose(); fs.Close(); fs.Dispose(); streamreader.Close(); streamreader.Dispose(); File.Copy(originalPath, originalPath + ".old", true); FileInfo newFile = new FileInfo(originalPath + ".tmp"); File.Delete(originalPath); File.Copy(fs., originalPath, true); result = true; } catch (Exception ex) { Console.WriteLine(ex); } return result; }` And the related exception System.IO.IOException: The process cannot access the file 'E:\mypath\myFile.cs' because it is being used by another process. at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.File.Delete(String path) at callingMethod.modifyFile(FileInfo file, String extractedMethod, String modifiedMethod) Normally these errors come from unclosed file streams, but I've taken care of that. I guess I've forgotten an important step but cannot figure out where. Thank you very much for your help,

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• Windows Server 2003 R2 Standard: Locks MS Office files, but not Adobe .AI and .PSD files?

  - by Bruce Garlock

  We have some shares setup on a Windows 2003 R2 server, and the MS Office files people save behave properly: The first person to open the file gets read/write, and the second person to open the file while the first person still has the file open, gets a read-only version. This is not true for the graphics files, like Adobe Illustrator .AI files, and Photoshop .PSD files. Anyone who goes to open these files has full read/write, even if someone else is already working on the file! This has lead to numerous file corruption issues, as well as other lost work, since it always saves the last changes to the file. How do we get Windows to properly lock these files so when someone is working on a file, and someone else wants to open one, they get read-only access? Many thanks, Bruce

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• Why does running "$ sudo chmod -R 664 . " cause me to get access denied on all affected directories?

  - by Codemonkey

  I have a project folder which has messy permissions on all files. I've had the bad tendency of setting everything to octal permissions 777 because it solved all non security related issues. Then FTP uploads, files created by text editors etc. has their own set of permissions making everything a mess. I've decided to take myself together and start using the permissions the way they were meant to be used. I figured 664 was a good default for all my files and folders, and I'd just remove permissions for others on private files, and add +x for executable files. The second I changed my project folder to 664 however: $ sudo chmod -R 664 . $ ls ls: cannot open directory .: Permission denied Which makes no sense to me. I have read/write permissions, and I'm the owner of the project folder. The leftmost part of ls -l in my project folder looks like this: -rw-rw-r-- 1 codemonkey codemonkey ... drw-rw-r-- 5 codemonkey codemonkey ... -rw-rw-r-- 1 codemonkey codemonkey ... -rw-rw-r-- 1 codemonkey codemonkey ... drw-rw-r-- 3 codemonkey codemonkey ... -rw-rw-r-- 1 codemonkey codemonkey ... -rw-rw-r-- 1 codemonkey codemonkey ... -rw-rw-r-- 1 codemonkey codemonkey ... drw-rw-r-- 4 codemonkey codemonkey ... drw-rw-r-- 5 codemonkey codemonkey ... I assume this has something to do with the permissions on the directories, but what?

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• File locked / read-only

  - by oshirowanen

  On a networked computer, I have a file which is coming up as read-only because someone else has it open. This is not true. This is a file stored locally on the computer and it is not being used by anyone else. I can login to the same computer using a different user, and the file opens up fine. I just get the issue with a particular user account. Other than deleting theses account/profile and creating it again, how can I unlock this file? Double clicking on this file gives me a message saying The file is locked for editing by another user, or the file (or the folder in which it is located,) is marked as read-only, or you specified that you wanted to open this file read-only. I don't think the folder is locked, because I can use other files in that folder fine, it's just 1 particular file which is causing this issue. I know that only 1 user is using this file as the file is on his c: and the same file works fine if he logs off to allow another user to log in.

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• Fragmented Log files could be slowing down your database

  - by Fatherjack

  Something that is sometimes forgotten by a lot of DBAs is the fact that database log files get fragmented in the same way that you get fragmentation in a data file. The cause is very different but the effect is the same – too much effort reading and writing data. Data files get fragmented as data is changed through normal system activity, INSERTs, UPDATEs and DELETEs cause fragmentation and most experienced DBAs are monitoring their indexes for fragmentation and dealing with it accordingly. However, you don’t hear about so many working on their log files. How can a log file get fragmented? I’m glad you asked. When you create a database there are at least two files created on the disk storage; an mdf for the data and an ldf for the log file (you can also have ndf files for extra data storage but that’s off topic for now). It is wholly possible to have more than one log file but in most cases there is little point in creating more than one as the log file is written to in a ‘wrap-around’ method (more on that later). When a log file is created at the time that a database is created the file is actually sub divided into a number of virtual log files (VLFs). The number and size of these VLFs depends on the size chosen for the log file. VLFs are also created in the space added to a log file when a log file growth event takes place. Do you have your log files set to auto grow? Then you have potentially been introducing many VLFs into your log file. Let’s get to see how many VLFs we have in a brand new database. USE master GO CREATE DATABASE VLF_Test ON ( NAME = VLF_Test, FILENAME = 'C:\Program Files\Microsoft SQL Server\MSSQL10.ROCK_2008\MSSQL\DATA\VLF_Test.mdf', SIZE = 100, MAXSIZE = 500, FILEGROWTH = 50 ) LOG ON ( NAME = VLF_Test_Log, FILENAME = 'C:\Program Files\Microsoft SQL Server\MSSQL10.ROCK_2008\MSSQL\DATA\VLF_Test_log.ldf', SIZE = 5MB, MAXSIZE = 250MB, FILEGROWTH = 5MB ); go USE VLF_Test go DBCC LOGINFO; The results of this are firstly a new database is created with specified files sizes and the the DBCC LOGINFO results are returned to the script editor. The DBCC LOGINFO results have plenty of interesting information in them but lets first note there are 4 rows of information, this relates to the fact that 4 VLFs have been created in the log file. The values in the FileSize column are the sizes of each VLF in bytes, you will see that the last one to be created is slightly larger than the others. So, a 5MB log file has 4 VLFs of roughly 1.25 MB. Lets alter the CREATE DATABASE script to create a log file that’s a bit bigger and see what happens. Alter the code above so that the log file details are replaced by LOG ON ( NAME = VLF_Test_Log, FILENAME = 'C:\Program Files\Microsoft SQL Server\MSSQL10.ROCK_2008\MSSQL\DATA\VLF_Test_log.ldf', SIZE = 1GB, MAXSIZE = 25GB, FILEGROWTH = 1GB ); With a bigger log file specified we get more VLFs What if we make it bigger again? LOG ON ( NAME = VLF_Test_Log, FILENAME = 'C:\Program Files\Microsoft SQL Server\MSSQL10.ROCK_2008\MSSQL\DATA\VLF_Test_log.ldf', SIZE = 5GB, MAXSIZE = 250GB, FILEGROWTH = 5GB ); This time we see more VLFs are created within our log file. We now have our 5GB log file comprised of 16 files of 320MB each. In fact these sizes fall into all the ranges that control the VLF creation criteria – what a coincidence! The rules that are followed when a log file is created or has it’s size increased are pretty basic. If the file growth is lower than 64MB then 4 VLFs are created If the growth is between 64MB and 1GB then 8 VLFs are created If the growth is greater than 1GB then 16 VLFs are created. Now the potential for chaos comes if the default values and settings for log file growth are used. By default a database log file gets a 1MB log file with unlimited growth in steps of 10%. The database we just created is 6 MB, let’s add some data and see what happens. USE vlf_test go -- we need somewhere to put the data so, a table is in order IF OBJECT_ID('A_Table') IS NOT NULL DROP TABLE A_Table go CREATE TABLE A_Table ( Col_A int IDENTITY, Col_B CHAR(8000) ) GO -- Let's check the state of the log file -- 4 VLFs found EXECUTE ('DBCC LOGINFO'); go -- We can go ahead and insert some data and then check the state of the log file again INSERT A_Table (col_b) SELECT TOP 500 REPLICATE('a',2000) FROM sys.columns AS sc, sys.columns AS sc2 GO -- insert 500 rows and we get 22 VLFs EXECUTE ('DBCC LOGINFO'); go -- Let's insert more rows INSERT A_Table (col_b) SELECT TOP 2000 REPLICATE('a',2000) FROM sys.columns AS sc, sys.columns AS sc2 GO 10 -- insert 2000 rows, in 10 batches and we suddenly have 107 VLFs EXECUTE ('DBCC LOGINFO'); Well, that escalated quickly! Our log file is split, internally, into 107 fragments after a few thousand inserts. The same happens with any logged transactions, I just chose to illustrate this with INSERTs. Having too many VLFs can cause performance degradation at times of database start up, log backup and log restore operations so it’s well worth keeping a check on this property. How do we prevent excessive VLF creation? Creating the database with larger files and also with larger growth steps and actively choosing to grow your databases rather than leaving it to the Auto Grow event can make sure that the growths are made with a size that is optimal. How do we resolve a situation of a database with too many VLFs? This process needs to be done when the database is under little or no stress so that you don’t affect system users. The steps are: BACKUP LOG YourDBName TO YourBackupDestinationOfChoice Shrink the log file to its smallest possible size DBCC SHRINKFILE(FileNameOfTLogHere, TRUNCATEONLY) * Re-size the log file to the size you want it to, taking in to account your expected needs for the coming months or year. ALTER DATABASE YourDBName MODIFY FILE ( NAME = FileNameOfTLogHere, SIZE = TheSizeYouWantItToBeIn_MB) * – If you don’t know the file name of your log file then run sp_helpfile while you are connected to the database that you want to work on and you will get the details you need. The resize step can take quite a while This is already detailed far better than I can explain it by Kimberley Tripp in her blog 8-Steps-to-better-Transaction-Log-throughput.aspx. The result of this will be a log file with a VLF count according to the bullet list above. Knowing when VLFs are being created By complete coincidence while I have been writing this blog (it’s been quite some time from it’s inception to going live) Jonathan Kehayias from SQLSkills.com has written a great article on how to track database file growth using Event Notifications and Service Broker. I strongly recommend taking a look at it as this is going to catch any sneaky auto grows that take place and let you know about them right away. Hassle free monitoring of VLFs If you are lucky or wise enough to be using SQL Monitor or another monitoring tool that let’s you write your own custom metrics then you can keep an eye on this very easily. There is a custom metric for VLFs (written by Stuart Ainsworth) already on the site and there are some others there are very useful so take a moment or two to look around while you are there. Resources MSDN – http://msdn.microsoft.com/en-us/library/ms179355(v=sql.105).aspx Kimberly Tripp from SQLSkills.com – http://www.sqlskills.com/BLOGS/KIMBERLY/post/8-Steps-to-better-Transaction-Log-throughput.aspx Thomas LaRock at Simple-Talk.com – http://www.simple-talk.com/sql/database-administration/monitoring-sql-server-virtual-log-file-fragmentation/ Disclosure I am a Friend of Red Gate. This means that I am more than likely to say good things about Red Gate DBA and Developer tools. No matter how awesome I make them sound, take the time to compare them with other products before you contact the Red Gate sales team to make your order.

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• Azure Full trust permissions

  - by kaleidoscope

  Under Windows Azure full trust, your role has access to a variety of system resources that are not available under partial trust File System Resources A role running in Windows Azure has permissions to read and write to certain file, directory, and volume resources on the server. These permissions are outlined in the following table.  File system resource Permission System root directory No access Subdirectories of the system root directory No access Windows directory Read access only Machine configuration files No access Service configuration file Read access only Local storage resource Full access Registry Resources The following table outlines permissions available to the role when accessing the registry while running in Windows Azure. HKEY_CLASSES_ROOT Read access HKEY_CURRENT_USER No access HKEY_LOCAL_MACHINE Read access HKEY_USERS Read access HKEY_CURRENT_CONFIG Read access More details can be found at: http://msdn.microsoft.com/en-us/library/dd573363.aspx   Amit, S

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• How to Restrict Android App Permissions

  - by Chris Hoffman

  Android forces you to agree to every permission an app wants, assuming you want to use the app. After rooting your device, you can manage permissions on a per-app basis. Restricting permissions allows you to protect your contacts and other private data from apps that demand access you’d rather not allow. Many apps will continue working properly after you revoke the permissions. HTG Explains: What Is RSS and How Can I Benefit From Using It? HTG Explains: Why You Only Have to Wipe a Disk Once to Erase It HTG Explains: Learn How Websites Are Tracking You Online

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• Intermittent bug - IE6 showing file as text in browser, rather than as file download

  - by Richard Ev

  In an ASP.NET WebForms 2.0 site we are encountering an intermittent bug in IE6 whereby a file download attempt results in the contents of the being shown directly in the browser as text, rather than the file save dialog being displayed. Our application allows the user to download both PDF and CSV files. The code we're using is: HttpResponse response = HttpContext.Current.Response; response.Clear(); response.AddHeader("Content-Disposition", "attachment;filename=\"theFilename.pdf\""); response.ContentType = "application/pdf"; response.BinaryWrite(MethodThatReturnsFileContents()); response.End(); This is called from the code-behind click event handler of a button server control. Where are we going wrong with this approach? Edit Following James' answer to this posting, the code I'm using now looks like this: HttpResponse response = HttpContext.Current.Response; response.ClearHeaders(); // Setting cache to NoCache was recommended, but doing so results in a security // warning in IE6 //response.Cache.SetCacheability(HttpCacheability.NoCache); response.AppendHeader("Content-Disposition", "attachment; filename=\"theFilename.pdf\""); response.ContentType = "application/pdf"; response.BinaryWrite(MethodThatReturnsFileContents()); response.Flush(); response.End(); However, I don't believe that any of the changes made will fix the issue.

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• Improving File Read Performance (single file, C++, Windows)

  - by david

  I have large (hundreds of MB or more) files that I need to read blocks from using C++ on Windows. Currently the relevant functions are: errorType LargeFile::read( void* data_out, __int64 start_position, __int64 size_bytes ) const { if( !m_open ) { // return error } else { seekPosition( start_position ); DWORD bytes_read; BOOL result = ReadFile( m_file, data_out, DWORD( size_bytes ), &bytes_read, NULL ); if( size_bytes != bytes_read || result != TRUE ) { // return error } } // return no error } void LargeFile::seekPosition( __int64 position ) const { LARGE_INTEGER target; target.QuadPart = LONGLONG( position ); SetFilePointerEx( m_file, target, NULL, FILE_BEGIN ); } The performance of the above does not seem to be very good. Reads are on 4K blocks of the file. Some reads are coherent, most are not. A couple questions: Is there a good way to profile the reads? What things might improve the performance? For example, would sector-aligning the data be useful? I'm relatively new to file i/o optimization, so suggestions or pointers to articles/tutorials would be helpful.

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• partially downloaded a torrent file and renamed it

  - by user2613789

  I have partially downloaded a torrent file in ubuntu and unfortunately i renamed it. and after some time i resumed the remaining torrent file.but the torrent then got downloaded with its default name and i lost the complete file information into two different files... please help me out...is there any way that i can produce the whole information into one file...i can't open either file that means both file got corrupted or so...the file is in mp4 format...please help me

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