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• Java: Check if file is already open

  - by hello_world_infinity

  I need to write a custom batch File renamer. I've got the bulk of it done except I can't figure out how to check if a file is already open. I'm just using the java.io.File package and there is a canWrite() method but that doesn't seem to test if the file is in use by another program. Any ideas on how I can make this work?

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• Trying to open a file in Ruby - Getting TypeError: can't convert String into Integer

  - by steve_gallagher

  Not sure whats going on here, or what could be the integer in this case. Here's the code: def build_array_from_file(filename) contents = [] File.read(File.expand_path('lib/project_euler/' + filename), 'r') do |file| while line = file.get contents << line end end contents end filename is a string and I've checked to make sure the path comes up valid. Any thoughts? Thanks.

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• How can I reset windows 7 file permissions?

  - by ssb

  I looked at this post and it seemed to be close to what I want, but my case might be a little worse: How can I reset my windows 7 file permissions to a rational state? Basically a while back I (very stupidly) changed the permissions on all sorts of system folders, and eventually rendered my computer virtually unusable. I managed to hack administrator privileges back onto key folders and getting it working, but in doing so I only modified permissions a lot more away from the natural state. I'm looking at this icacls stuff, but ultimately I need to reset EVERYTHING back to what it was in The Beginning, before I messed with it, from the C: directory all the way down. Right now application data is what's giving me problems, and I can't get it to work no matter how much I fiddle with those specific permissions. I will be forever grateful for help on how to do this without having to reformat.

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• Setup a local file server for two networks

  - by rzlines

  Hi I would like to setup a local linux file server (using centos and samba) that can be accessed by two independent local networks in the same house. I have 2 networks on the same floor which have Windows 7 computers, but the networks are split as we have 2 internet connections. How do I go about this? Additional info: Currently both the networks use DropBox to send files to each other but that happens via the Internet and hence its slow. Would like to achieve the same locally to increase the speed.

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• Solution for file store needing large number of simultaneous connections

  - by Tennyson H

  So I'm fairly new to large-scale architectures. We're currently using linode instances for our project, but we're brainstorming about scaling. We need a file store system than can deliver ~50mb folders (user data) to our computing instances in a reasonable amount of time (<20 sec), and scale to 10000+ total users, and perhaps 100+ simultaneous transfers. We are also unsure whether to network mount (sshfs/nfs) or just do a full transfer store-instance at the beginning and rsync instance- store at the end. I've experimented with SSH-FS between our little Linode instances but it seems to be bottlenecked at 15mb/s total bandwith, which wouldn't do under 10+ transfer stress let alone scale v. large. I also tried to investigate NFS but couldn't get it working but have little hope that it'll do within our linode network. Are there tools on other cloud providers that match our needs? Should we be mounting, or should we be transferring? Thanks very much!

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• Naming a file downloaded from url in iPhone

  - by hgpc

  I would like to save a file downloaded from the internet in iPhone. Can I use the url as the file name? If not, what transformation should I apply to the url to obtain a valid file name? I need to find the local copy of the file later using its url.

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• C++ write to front of file

  - by user231536

  I need to open a file as ofstream and write to the front of the file, while preserving the remaining contents of the file, which will be "moved". Similar to "prepend" a file. Is this possible using the STL or boost ?

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• Error while executing (.exe ) from windows command script (.cmd) file

  - by mahesh

  I have the following syntax in the .cmd file, where PathList is console application with .exe as extension. cd D:\Sample D: PathList 2> file.txt This syntax works fine if the file is saved with .bat as extension, but if save it with .cmd extension it throws error saying 'PathList' is not recognized as an internal or external command, operable program or batch file. Please can i know what is the issue with saving it with .cmd extension

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• Settings what-opens-what once and for all (Backing up File Associations)

  - by ldigas

  Every time I switch machines (as in, get a new one, or reinstall an OS or something like that) my precious file associations get lost. And the next six months pass slowly until I again set them up right. Is there a program that allows me to: Set all the extensions I would like to open with let's say, Vim, without setting each one of them individually. Something of a kind: Vim opens: .... list of extensions ... and/or A program which lets me backup my current settings, and when I copy those to a new machine it lets me just modify the paths where I putted the applications in question, and it does the rest (again, associates that program with all the extensions it opened before).

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• Nautilus file share for multiple users is not working. Only owner gets access.

  - by Niklas

  I have always had trouble setting up samba shares with ubuntu. In the past I've tried getting it to work by configuring /etc/samba/smb.conf but never achieved what I wanted. Last time I managed to get it working by making a share with nautilus built in file sharing (which utilises samba). Now when I try do it again I doesn't work. (running ubuntu 10.10 Desktop x64) What I'm trying to achieve is a share which is available for multiple users (those who are in the same group) and not just the owner (who also is included in the group). As it is now I can connect with only the owner, the others are getting an error when I try to connect with windows 7. All the users are within the same group and the folder permissions are 770. The files and folders have the correct group settings. I think there is no restrictions in the User Settings for the other users blocking them and I marked "make available to other users (or whatever it says)" in the file sharing dialog. What can I do?

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• Pagination for product listing, what to use? "canonical" or "rel-prev-next" or do nothing?

  - by Jayapal Chandran

  I want to make sure my product listing is 10 products per page which are not in a series (link). They have explained how to use canonical or rel prev for pagination when a long page has been divided into multiple page and the multiple pages becomes a series were as my condition is not that. They are unique listing which are not related to each listing... All the listing links leads to a product profile page. So lets say my site is all about cars and I have a Used Audi page with 1000 Audi's for sale. There are 10 used audi cars on each page so there's 100 pages in the series. If I start to utilise Rel="prev" and rel="next" should I set page 2 onwards as index,follow or noindex,follow? The content on Page 2 all the way to 100 only changes ever so slightly as different cars will be for sale on different pages but from a "Panda" point of view the pages are incredibly similar as they'd hold the same meta data as page 1 in the series along with duplicate reviews & news etc. I want Page 1 in the series as the Main page for Google to send users too and I don't see the point in Google indexing page 2 100. What's everyone's view on this? Lastly with the rel="canonical" tag should page 2 to 100 all point back to page 1 in the series or the individual page itself? E.G: /used-audi/page-3/.

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• What is the best practice for reading a large number of custom settings from a text file?

  - by jawilmont

  So I have been looking through some code I wrote a few years ago for an economic simulation program. Each simulation has a large number of settings that can be saved to a file and later loaded back into the program to re-run the same/similar simulation. Some of the settings are optional or depend on what is being simulated. The code to read back the parameters is basically one very large switch statement (with a few nested switch statements). I was wondering if there is a better way to handle this situation. One line of the settings file might look like this: #RA:1,MT:DiscriminatoryPriceKDoubleAuction,OF:Demo Output.csv,QM:100,NT:5000,KP:0.5 //continues... And some of the code that would read that line: switch( Character.toUpperCase( s.charAt(0) ) ) { case 'R': randSeed = Integer.valueOf( s.substring(3).trim() ); break; case 'M': marketType = s.substring(3).trim(); System.err.println("MarketType: " + marketType); break; case 'O': outputFileName = s.substring(3).trim() ; break; case 'Q': quantityOfMarkets = Integer.valueOf( s.substring(3).trim() ); break; case 'N': maxTradesPerRound = Integer.valueOf( s.substring(3).trim() ); break; case 'K': kParameter = Float.valueOf( s.substring(3).trim() ); break; // continues... }

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• Delphi7 - How can i copy a file that is being written to

  - by Simon

  I have an application that logs information to a daily text file every second on a master PC. A Slave PC on the network using the same application would like to copy this text file to its local drive. I can see there is going to be file access issues. These files should be no larger than 30-40MB each. the network will be 100MB ethernet. I can see there is potential for the copying process to take longer than 1 second meaning the logging PC will need to open the file for writing while it is being read. What is the best method for the file writing(logging) and file copying procedures? I know there is the standard Windows CopyFile() procedure, however this has given me file access problems. There is also TFileStream using the fmShareDenyNone flag, but this also very occasionally gives me an access problem too (like 1 per week). What is this the best way of accomplishing this task? My current File Logging: procedure FSWriteline(Filename,Header,s : String); var LogFile : TFileStream; line : String; begin if not FileExists(filename) then begin LogFile := TFileStream.Create(FileName, fmCreate or fmShareDenyNone); try LogFile.Seek(0,soFromEnd); line := Header + #13#10; LogFile.Write(line[1],Length(line)); line := s + #13#10; LogFile.Write(line[1],Length(line)); finally logfile.Free; end; end else begin line := s + #13#10; Logfile:=tfilestream.Create(Filename,fmOpenWrite or fmShareDenyNone); try logfile.Seek(0,soFromEnd); Logfile.Write(line[1], length(line)); finally Logfile.free; end; end; end; My file copy procedure: procedure DoCopy(infile, Outfile : String); begin ForceDirectories(ExtractFilePath(outfile)); //ensure folder exists if FileAge(inFile) = FileAge(OutFile) then Exit; //they are the same modified time try { Open existing destination } fo := TFileStream.Create(Outfile, fmOpenReadWrite or fmShareDenyNone); fo.Position := 0; except { otherwise Create destination } fo := TFileStream.Create(OutFile, fmCreate or fmShareDenyNone); end; try { open source } fi := TFileStream.Create(InFile, fmOpenRead or fmShareDenyNone); try cnt:= 0; fi.Position := cnt; max := fi.Size; {start copying } Repeat dod := BLOCKSIZE; // Block size if cnt+dod>max then dod := max-cnt; if dod>0 then did := fo.CopyFrom(fi, dod); cnt:=cnt+did; Percent := Round(Cnt/Max*100); until (dod=0) finally fi.free; end; finally fo.free; end; end;

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• Benchmarking a file server

  - by Joel Coel

  I'm working on building a new file server... a simple Windows Server box with a few terabytes of disk space to share on the LAN. Pain for current hard drive prices aside :( -- I would like to get some benchmarks for this device under load compared to our old server. The old server was installed in 2005 and had 5 136GB 10K disks in RAID 5. The new server has 8 1TB disks in two RAID 10 volumes (plus a hot spare for each volume), but they're only 7.2K rpm, and of course with a much larger cache size. I'd like to get an idea of the performance expectations of the new server relative to the old. Where do I get started? I'd like to know both raw potential under different kinds of load for each server, as well an idea of what our real-world load looks like and how it will translate. Will disk load even matter, or will performance be more driven by the network connection? I could probably fumble through some disk i/o and wait counters in performance monitor, but I don't really know what to look for, which counters to watch, or for how long and when. FWIW, I'm expecting a nice improvement because of the benefits of having two different volumes and the better RAID 10 performance vs RAID 5, in spite of using slower disks... but I'd like to get an idea of how much.

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• Spurious alleged file corruption on Windows 7

  - by Johannes Rössel

  Recently my Laptop sometimes warns about corrupted files on the hard drive (Samsung SSD PB22-JS3 TM). This has only happened so far when updating (or checking out) an SVN repository with either TortoiseSVN or the command line Subversion client. The fun thing is that the corrupted file has always been a .svn directory (although the directory entry may contain files in that directory too, if they're small enough?—?which should be the case with SVN). However, when looking into the warned-about directory I notice nothing strange or unusual and don't get any more warnings about it and another try (SVN stops updating once that error occurs?—?TortoiseSVN even with an appropriate error message) of updating the working copy works (well, mostly; sometimes it does it again, albeit with a different directory). Since the laptop is only a few months old I doubt the SSD is failing already—five months of normal usage shouldn't be too surprising. Also it (so far) occurred only with SVN updates on a large repository. Maybe that's too many writes in a short time and some part between the software and the hardware doesn't quite catch up fast enough or so?—?I don't know enough about this to actually make an informed guess here. Anyone knows what's up here? ETA: Note to add: I've run chkdsk (it seems to schedule itself anyway when this happens) and it didn't find anything out of the ordinary.

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• Spurious alleged file corruption with an SSD

  - by Johannes Rössel

  Recently my Laptop sometimes warns about corrupted files on the hard drive (Samsung SSD PB22-JS3 TM). This has only happened so far when updating (or checking out) an SVN repository with either TortoiseSVN or the command line Subversion client. The fun thing is that the corrupted file has always been a .svn directory (although the directory entry may contain files in that directory too, if they're small enough?—?which should be the case with SVN). However, when looking into the warned-about directory I notice nothing strange or unusual and don't get any more warnings about it and another try (SVN stops updating once that error occurs?—?TortoiseSVN even with an appropriate error message) of updating the working copy works (well, mostly; sometimes it does it again, albeit with a different directory). Since the laptop is only a few months old I doubt the SSD is failing already—five months of normal usage shouldn't be too surprising. Also it (so far) occurred only with SVN updates on a large repository. Maybe that's too many writes in a short time and some part between the software and the hardware doesn't quite catch up fast enough or so?—?I don't know enough about this to actually make an informed guess here. Anyone knows what's up here? ETA: Note to add: I've run chkdsk (it seems to schedule itself anyway when this happens) and it didn't find anything out of the ordinary.

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• Listing group members using ldapsearch

  - by colemanm

  Our corporate LDAP directory is housed on a Snow Leopard Server Open Directory setup. I'm trying to use the ldapsearch tool to export an .ldif file to import into another external LDAP server to authenticate with externally; basically trying to be able to use the same credentials internally and externally. I've got ldapsearch working and giving me the contents and attributes of everything in the "Users" OU, and even filtering down to only the attributes I need: ldapsearch -xLLL -H ldap://server.domain.net / -b "cn=users,dc=server,dc=domain,dc=net" objectClass / uid uidNumber cn userPassword > directorycontents.ldif That gives me a list of users and properties that I can import to my remote OpenLDAP server. dn: uid=username1,cn=users,dc=server,dc=domain,dc=net objectClass: inetOrgPerson objectClass: posixAccount objectClass: organizationalPerson uidNumber: 1000 uid: username1 userPassword:: (hashedpassword) cn: username1 However, when I try the same query on an OD "group" instead of a "container," the results are something like this: dn: cn=groupname,cn=groups,dc=server,dc=domain,dc=net objectClass: posixGroup objectClass: apple-group objectClass: extensibleObject objectClass: top gidNumber: 1032 cn: groupname memberUid: username1 memberUid: username2 memberUid: username3 What I really want is a list of users from the top example filtered based on their group memberships, but it looks like membership is set from the Group side, rather than the user account side. There must be a way to filter this down and only export what I need, right?

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• Listing group members using ldapsearch

  - by colemanm

  Our corporate LDAP directory is housed on a Snow Leopard Server Open Directory setup. I'm trying to use the ldapsearch tool to export an .ldif file to import into another external LDAP server to authenticate with externally; basically trying to be able to use the same credentials internally and externally. I've got ldapsearch working and giving me the contents and attributes of everything in the "Users" OU, and even filtering down to only the attributes I need: ldapsearch -xLLL -H ldap://server.domain.net / -b "cn=users,dc=server,dc=domain,dc=net" objectClass / uid uidNumber cn userPassword > directorycontents.ldif That gives me a list of users and properties that I can import to my remote OpenLDAP server. dn: uid=username1,cn=users,dc=server,dc=domain,dc=net objectClass: inetOrgPerson objectClass: posixAccount objectClass: organizationalPerson uidNumber: 1000 uid: username1 userPassword:: (hashedpassword) cn: username1 However, when I try the same query on an OD "group" instead of a "container," the results are something like this: dn: cn=groupname,cn=groups,dc=server,dc=domain,dc=net objectClass: posixGroup objectClass: apple-group objectClass: extensibleObject objectClass: top gidNumber: 1032 cn: groupname memberUid: username1 memberUid: username2 memberUid: username3 What I really want is a list of users from the top example filtered based on their group memberships, but it looks like membership is set from the Group side, rather than the user account side. There must be a way to filter this down and only export what I need, right?

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• Slow File Copy observed copying 40GB files across network to iSCSI device

  - by Rick

  Here's a curious ones for the gurus: Setup: Source Machine: Windows Server 2003 R2 machine with local hard drive. VHD file of 40GB. 1 x 1Gbps network card, Cat6 cable, switch. Target Machine: Windows Server 2008 R2 machine with iSCSI connection to iSCSI target on separate machine (1TB, RAID5). 1 x 1Gbps network card, Cat6 cable, connected to same switch as for Source Machine. Second 1Gbps network card, Cat6 cable, connected via isolated switch to the iSCSI target. Switches are Netgear JGS524 model (web managed). If I copy from the Win2003R2 machine to Win2008R2 machine local drive I get 40GB in 45 minutes, 36 seconds. If I copy from the Win2008R2 machine to the iSCSI target (local drive to iSCSI target) I get 40GB in 37 minutes 56 seconds. If I copy from the Win2003R2 machine to the iSCSI target via the Win2008R2 machine I get 40GB in 3 hours, 50 minutes, 24 seconds. All copies were done via the following command issued on the Win2008R2 box: XCOPY <source> <target> /J XCOPY /J - Copies using unbuffered I/O. Recommended for very large files. So, what's the bit I'm missing here? Why does a back-to-back copy take in total 1 hour, 23 minutes, 32 seconds when a "straight through" copy take almost 3 times as long? Switches show no errors, network hovers around the 3% utilisation mark for the duration of the copy (whereas the "back-to-back" copies are around the 25% utilisation mark). What have I missed?

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• Access denied error 3221225578 with file sharing to Windows server

  - by Ian Boyd

  i'm trying to access the shares on a server. The credential box appears, and i enter in a correct username and password, and i get access denied. The silly thing is that i can Remote Desktop to the server (using the same credentials), and i can check the Security event log for the access denied errors: Event Type: Failure Audit Event Source: Security Event Category: Account Logon Event ID: 681 Date: 3/19/2011 Time: 11:54:39 PM User: NT AUTHORITY\SYSTEM Computer: STALWART Description: The logon to account: Administrator by: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0 from workstation: HARPAX failed. The error code was: 3221225578 and Event Type: Failure Audit Event Source: Security Event Category: Logon/Logoff Event ID: 529 Date: 3/19/2011 Time: 11:54:39 PM User: NT AUTHORITY\SYSTEM Computer: STALWART Description: Logon Failure: Reason: Unknown user name or bad password User Name: Administrator Domain: stalwart Logon Type: 3 Logon Process: NtLmSsp Authentication Package: NTLM Workstation Name: HARPAX Looking up the error code (3221225578), i get an article on Technet: Audit Account Logon Events By Randy Franklin Smith ... Table 1 - Error Codes for Event ID 681 Error Code Reason for Logon Failure 3221225578 The username is correct, but the password is wrong. Which would seem to indicate that the username is correct, but the password is wrong. i've tried the password many times, uppercase, lowercase, on different user accounts, with and without prefixing the username with servername\username. What gives that i cannot access the server over file sharing, but i can access it over RDP?

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• Relation between server_name in nginx sites-available, /etc/hosts file and A-records

  - by user2818584

  I have the following two server-blocks in my config-file in sites-available: server { listen 80; server_name www.mydomain.be; root /usr/share/nginx/html; index index.html index.htm; location / { try_files $uri $uri/ =404; } } server { listen 80; server_name sub.mydomain.be; root /usr/share/nginx/sub; index index.html index.htm; location / { try_files $uri $uri/ =404; } } I also created an A-record for both www.domain.be and sub.domain.be with the IP of my server as value. Yet, when I try to reload my nginx configuration with service nginx reload it fails. When I remove the second server-block, it reloads as expected. I know this topic is popular, and that there are loads of such [nginx][subdomain] questions here, but none of them seems to discuss explicitly how the following three things hang together: virtual hosts or server blocks in nginx (est. server_name matching) the effect of A-records on how nginx processes requests the need to add hosts to /etc/hosts Right now I have the impression that a lack of knowledge of this bigger picture, rather than specific knowledge of nginx configuration prevents me from making this work.

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• correct file permissions for trac and git user to access gitolite server repos

  - by klemens

  hi, sounds like a stupid questions (to me), but i couldn't find any info. on my server i host some git repositories via gitolite, and have a trac for every repository. i have a user called git to push/pull from server (git clone git@server:repo). and trac is a apache vhost with mod_wsgi. this runs with the www-data user. so what riddles me (maybe because I have not much of a clue about file-permissions at all) is whats the best permissions setup (chown, chmod) for the git repositories (/home/git/repositories/...). www-data (or trac) needs to at least read permissions (i think). and git (or gitolite) needs obviously read/write permissions to push changesets. i tried a little bit around (i.e. adding www-data and/or git to the www-data/git group), but didn't got it right. at least one of the two don't work (git or trac). any suggestions are highly appreciated. regard, klemens

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• File Open/Save Dialog always 'Not Responding'

  - by Amanda

  I am aware that this question has been asked once, however the solution for them didn't work with me. Whenever I go to open/save a file in any program, the dialog does not come up, and the application goes to 'Not Responding'. This goes on for about a few minutes, and then stops, but still does not open the dialog. There have been a few occasions where the dialog has suddenly worked for a while, but then the problem comes back. I have tried many solutions given around the internet, I have cleaned it with CCleaner, disk defragged it, sorted the index. Nothing works. Is there anybody who has any idea what the problem is? This is Windows Vista. I'm not quite sure what kind of information you guys would need about my laptop, but I'll give you it if you need it. :) Solutions I have Tried: I have tried deleting the 'Shellicon' folder in the registry, which wasn't even in there. I have looked for mapped network drives lingering around, and I haven't come across any. I have tried rebuilding teh Widnows Search Indexes...no difference.

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• Windows 7 SSH file server

  - by Siriss

  Hello all- I have looked at the other posts, but have not quite found an answer I have a question about windows file sharing over SSH. I have copssh installed and it is working for Remote desktop connections. I have port 22 forwarded on my router etc. I connect from a Mac or Putty with this address: ssh -l copsshusername 3391:localhost:3389 [external ip] That works fine. I would like to configure Windows 7 to allow my ssh account that I use to login, access to certain shared folders. I have documents and videos and things that I would like to be able to download externally. I have done this before on Linux and a long time ago on XP, but I cannot figure out what I am missing on Windows 7. There is a designated SSH user that copssh uses to run the service and that I use to to login as. I have googled and googled and have not found a solution that does everything I need that is why I am turning here for ideas. I hope I am explaining this correctly. Thank you very much for your help!

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• How can I tell why I have access to a file share on Windows Server

  - by Joel

  I have a file share on a Windows 2008 R2 server in a AD domain (call it \SECURESERVER\STUFF) and I am not sure if I have the share and folder permissions set up right. I noticed the problem when I set up new server (WORKGROUP\FOREIGNSERVER) that was not joined to the domain and tried to copy some files off of \SECURESERVER\STUFF. I was surprised to find that when I tried to access the files, it did not prompt me for a username and password and proceeded to give me full access to the files. That worried me so I tried the same thing on some workstations that were not in the domain and they did NOT have the same behavior (they did prompt for a username/password as desired/expected). So, I think there is something peculiar about FOREIGNSERVER. I am logging into it with a local admin account, but my domain and SECURESERVER should know nothing of this server. I've carefully gone through the share and folder permissions on the share but I can't find the reason that FOREIGNSERVER has access. How can I find out why FOREIGNSERVER has access to SECURESERVER?

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