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• How can I see the metadata of an ISO file?

  - by netvope

  I have been searching for the list of metadata field of an ISO file on Google but couldn't find anything. That made me think that there isn't any metadata in an ISO file, just the files content and their properties. However, today I find in ImgBurn that there is a field called Imp ID, which typically contains the software used to create the ISO file. I'm not sure if it is specific to the UDF and/or CDFS filesystem. What are the other possible metadata fields in an ISO file? What software may I use to see them?

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• How can I crop every page of a large PDF file?

  - by Andrew

  I have a 1300 page PDF file of a scanned book that was unfortunately not cropped when scanned. The actual book page dimensions are around 6x9", but each scanned page is 8.5x11", the size of the scanner bed. For much smaller PDF files I could throw it into Photoshop and crop the page, but this is a huge file. What is the best way to losslessly crop all of the pages of the file, in either Windows or OS X?

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• I believe I need a wireless access point, but can I do it with a wifi router?

  - by Flotsam N. Jetsam

  My needs are simple, I think: I have a laptop upstairs with a usb wifi that I use to connect to my neighbor's wifi which I share (with their knowledge). I have a laser printer downstairs that my wife doesn't wants to stay down there (big, bulky and ugly), but that we both need to print stuff off. It has wired networking and I have wired hub and router down there. The usb wifi on the laptop has absolutley the best reception I've ever seen or heard of. I cannot get onto the neighbor's net with the thing downstairs though--sortof in the ground. What do I need downstairs to give printer access to my laptop wirelessly? One thing I can't do in this solution is have a computer on downstairs, so I would think that would eliminate a usb solution.

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• Linux - why am i allowed to remove root file?

  - by 0xDEAD BEEF

  Situation as follows: i do su to root, then i create admin file with cat adminfile then i exit from root issuing exit command i can see following adminfile options -rw-r--r-- 1 root root 10 2010-06-16 16:25 adminfile however, after executing rm adminfile it really gets removed -rw-r--r-- 1 root root 10 2010-06-16 16:25 adminfile reinis@reinis-desktop:~/Test/script$ rm adminfile rm: remove write-protected regular file `adminfile'? tada.. file is gone! As i see it - others have only read permision for that file so they shouldnot be able to remove it.. :/

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• How to open the file under cursor in vim when its listing directory contents(Netrw Directory Listing)

  - by balki

  I can press o but it creates a new window and opens the file there. I want it to open in the same window. At least it should display on the same window each time open some file but it creates new windows for each file I open. Also is there a way to make it open as a vertical split and not horizontal split? Where can I find the complete documentation/cheatsheet of all possible commands in 'Netrw Directory Listing' mode?

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• How to allow Mac OS X's native Apache/PHP installation to access WebServer directories?

  - by Martin Bean

  I have a problem bugging me with Mac OS X's native Apache/PHP installation. With my PHP scripts, I have to alter the file permissions on each folder I want to access. For example, in an upload script I would have to set the destination directory to 'read & write' for the group 'everyone'. However, I believe this is not the best practice and would like all of my directories to be readily writable to PHP. My scripts are stored in /Library/WebServer/Documents/, which is Mac OS X's default directory to serve web pages locally.

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• File/folder Write/Delete wise, is my server secure?

  - by acidzombie24

  I wanted to know if someone got access to my server by using a nonroot account, how much damage can he do? After i su someuser I used this command to find all files and folders that are writeable. find / -writable >> list.txt Here is the result. Its most /dev/something and /proc/something and these /var/lock /var/run/mysqld/mysqld.sock /var/tmp /var/lib/php5 Is my system secure? /var/tmp makes sense but i am unsure why this user has write access to those folders. Should i change them? stat /var/lib/php5 gives me 1733 which is odd. Why write access? why no read? is this some kind of weird use of a temp file?

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• Disadvantages of using a swap file/partition on an SSD, even when swappiness is set to 0

  - by pjv

  What are the disadvantages of using a swap file/partition on an SSD, even when swappiness is set to 0 I'm particularly interested in the /proc/sys/vm/swappiness=0 case. How much writes are still done, in practice, to that swap file, and does it have a negative impact to the SSD or any other disadvantage? Or would it nearly compare to not having a swap file? I am pretty aware of what swappiness=0 means, just not of what it amounts to in practice. My question stems from a problem I am experiencing without a swap: http://stackoverflow.com/questions/4567972/error-executing-aapt-all-of-the-sudden. There are similar questions regarding SSD and swap but they don't go in-depth into the swappiness=0: Disadvantages of not having a swap partition, Should I keep my swap file on an SSD drive?

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• What could cause a file system to spontaneously unmount or become invalid for a short time?

  - by Ichorus

  We've got DB2 LUW running on a RHEL box. We had a crash of DB2 and IBM came back and said that a file that DB2 was trying to access (through open64()) unmounted or became invalid. We have done nothing but restart the database and things seem to be running fine. Also, the file in question looks perfectly normal now: $ cd /db/log/TEAMS/tmsinst/NODE0000/TEAMS/T0000000/ $ ls -l total 557604 -rw------- 1 tmsinst tmsinst 570425344 Jan 14 10:24 C0000000.CAT $ file C0000000.CAT C0000000.CAT: data $ lsattr C0000000.CAT ------------- C0000000.CAT $ ls -l total 557604 -rw------- 1 tmsinst tmsinst 570425344 Jan 14 10:24 C0000000.CAT With those facts in hand (please correct me if I am mis-interpreting the data at hand) what could cause a file system to 'spontaneously unmount or become invalid for a short time'? What should my next step be? This is on Dell hardware and we ran their diagnostic tools against the hardware and it came back clean.

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• Office 2010 & Windows 7 - 'File' is currently in use. Try again later

  - by thing2k

  The issue: when saving a document from either Word, Excel or PowerPoint 2010, every so often it will show the message 'file' is currently in use. Try again later. We started our rollout of Windows 7 beginning of this year, and this issue was infrequent, but is now affecting enough people to be a problem. Usually, if you clear the alert, then save again, it works fine, though only in Word or Excel. Annoyingly, PowerPoint has a bad habit of changing the file to read-only after the error. So the only choice is to save to a new file name. The issue seems to only happen to files in the user's My Documents, which is a redirection folder from their HomeShare. The HomeShares are spread across 3 different file servers, 2 Windows 2003 and 1 Windows 2008 R2. Has anyone seen this issue and know how to fix it?

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• How can give privilege for DB to a user [ ERROR 1044 (42000): Access denied for user ''@'localhost']

  - by Ahn

  I have created user in mysql 5.1 and given the ALL privilege, details given below, mysql> show GRANTS FOR test; +-------------------------------------------------------------+ | Grants for test@% | +-------------------------------------------------------------+ | GRANT ALL PRIVILEGES ON *.* TO 'test'@'%' WITH GRANT OPTION | | GRANT ALL PRIVILEGES ON `tt`.* TO 'test'@'%' | +-------------------------------------------------------------+ 2 rows in set (0.00 sec) But the show databases is not showing the databases on the mysql. It only shows as given below. How can give privilege for other DB s tables as well for the user 'test'? mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | test | +--------------------+ Error while I tried to use the mysql DB as user test: mysql> use mysql; ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'mysql'

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• Can a consumer wireless router act as both a wireless client and access point?

  - by glibdud

  I'm going to be moving in the future, and integrating my home network into that of my landlord. I wish to maintain an isolated network while using his internet connection, so I'm planning on cascading my router off of his (WAN-to-LAN type configuration). Unfortunately, it looks like it might not be feasible to run a wire between the two. Therefore, I'd like to send my WAN connection over WiFi to his router. At my disposal, I have a WRT54GL (running Shibby's Tomato mod), and I just bought an Asus RT-N66U (I can be flexible with the firmware). My first thought was to set up the WRT as a wireless bridge, then run a wire between that and the N66U's WAN port. I'm reasonably sure I could make that work, but can I eliminate the WRT from the equation altogether? Can the N66U connect to the landlord's WiFi as a client, effectively using that as the WAN port, while simultaneously providing wireless access to my devices on an altogether different WLAN?

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• Know any file compare utility for chunks of text?

  - by Belun

  Is there any file-compare utility-software that can help me compare chunks of text from two text files ? As in, I want to know what chunks of text that are in one file can be found again in the second file. What I need to do is more like a 'compare and search' operation, not just a compare line by line. I need this for finding common errors in application logs. Eg., I have a Java application and logs from two different days. I want to find out which stack-traces (that are actually chunks of text inside a text file) are common to both days.

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• what player on windows can play mp4 with another audio channel file as track 2?

  - by blurayplayer

  i want to play an mp4 file or a blu ray rip with another audio channel as a separate file, can that be done in vlc or another player? if so how? without having to convert/merge it with the video into a single file, I just want to stream them in one player... Thanks

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• Tools to extract text from powerpoint pptx in linux?

  - by felix

  Any there any linux tools that will extract the text from a Powerpoint pptx file? I tried catppt but it just returns file.pptx is not OLE file or Error. abiword --to=txt file.pptx also returns an empty text file. I can open the file in libreoffice but it doesn't seem to have an "export as text" option. As a guess I also tried libreoffice --headless --convert-to txt:Text file.pptx but that doesn't even return an empty file.

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• In VirtualBox, how can I access host localhost from guest (Visual Studio Dev Server from IE7 testing VM)?

  - by Seth

  Host OS is Win7 running MyApp in the Visual Studio Development Server, bound to localhost:51227, VM is VirtualBox configured with NAT. Guest OS is Win XP with IE7 installed. My goal is to debug MyApp (running on host) from within IE7 (running on guest). Visual Studio Development server only binds to the loopback network device (i.e. localhost). It does not bind to the external IP address of my host. I've tried access 10.0.2.2:51227 from IE7 on the guest (and confirmed that 10.0.2.2 is the gateway address using ipconfig), but it appears that 10.0.2.2 binds to the external IP of the Host, NOT the loopback IP (localhost), so this does not work. Any suggestions?

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• Something keeps changing the default permissions of my settings.php file for a web site on Linux

  - by JrSysAdmin

  I keep changing the file permissions for the file /var/www/html/websitename/settings.php to 775 and within 15 minutes or so it automatically changes back 555. The owner of the file is "apache" and the group ownership is for our Linux Developers just like all of the other files which are not having this issue. Obviously there must be some sort of process running that is automatically changing the file permissions (apache maybe?) but I haven't been able to figure out. Any help would be greatly appreciated.

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• How can I make .vimrc read from an external file?

  - by GorillaSandwich

  I'd like to modify my .vimrc to read the value of a variable from an external file. How can I do this? Specifically, a friend and I share a git repo with our .vim files, but there are a few small differences in what we want in our configs. So most of the file is common, but we use if statements to determine whether to load user-specific sections, like this: let whoami = "user2" if whoami == "user1" ... After checking our common .vimrc out of source control, we each have to change the let whoami assignment so our own section will be loaded. Instead, I'd like to keep a separate file, which can be different for each of us, and from which vim will load that variable value. Maybe another angle on this is: Will vim automatically read all the files in my .vim directory? If so, we could each put a symlink in there called username.vim, and link that to an external file that would be different for each of us.

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• Trying to unpack 2.5GB .tar.gz file on Linux but getting "An error occurred while trying to open the archive"

  - by TMM

  Hi, Is there a limit on Linux for the file size of a .tar.gz (or its contents). I am currently creating a .tar.gz (both through the UI/"Compress As" and also through the command line) file for 2 files (6GB and 2GB), and even though it is created successfully, when I try to unpack it using Ark it throws the error "An error occurred while trying to open the archive". I have seen some places that it might be better to archive the file into several smaller .tar.gz files, but I was wondering exactly how to do this (and subsequently unpack the files). Also, is it totally impossible to use the 1 .tar.gz file approach as this would be much simpler. Thanks in advance, Tim

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• Under *nix, how can I find a string within a file within a directory ?

  - by roberto

  Hi all. I'm using ubuntu linux, and I use bash from with a terminal emulator every day for many tasks. I would like to know how to find a string or a substring within a file that is within a particular directory. If I was knew the file which contained my target substring, I would just cat the file and pipe it through grep, thus: cat file | grep mysubstring But in this case, the pesky substring could be anywhere within a known directory. How do I hunt down my substring ?

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• Best way to restrict FTP access to a single directory?

  - by John Debs

  I have a VPS running Ubuntu 10.04, and I'd like to give someone SFTP access to a single directory, but prevent them from seeing anything else on the system. What's the best way to pull this off? I considered removing "everyone" permissions from everything on the system, but that seems like a really blunt tool for this problem (and one that'll cause other issues) - I'm hoping there's a better option here. Edit: I appreciate the answers! (And I learned a bunch reading/researching through them). I ended up finding and using this guide from Linode as it spelled all the steps: http://library.linode.com/security/sftp-jails/

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• How to restrict access to other Wifi networks in range?

  - by meetpd

  Is there a way to access connecting to other wifi networks in range? I have an office and there are few wifi networks in range. Some of them are not password protected and invariably I get connected to that wifi first. I have talked to the person who owns that wifi. But he is somehow not listening about adding password to his network. So, is there a way I can block that Wifi network completely so that I do not connect to it? I have Win 7 and Mac at my office.

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• Why am I unable to access the network shares on my own computer?

  - by DoomStone

  I am having some problems with media center computer, with Windows 7 on it. The computers IP address is 192.168.1.13, and another computer can without any problem navigate to \\192.168.1.13, but the computer itself can not. Neither \\servername nor \\localhost. If I reboot the computer a couple of times, it will work again, but this is a big problem as my computer cleans my media center library on boot and there, if it can not access \\192.168.1.13, it will think that all the files have been removed and therefore delete them from the database. I really have no idea on where to start with this problem, but if anyone has tried this before and fixed it, I would be very happy, as it would save me from having to reinstall the whole system.

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• Ubuntu: On a network with many clients there are two machines that can't access the web via a browser at the same time

  - by ChrisInCambo

  Ok I'm pulling my hair out over this one. We have a wireless network with many clients all working well except two Ubuntu clients running 10.10 that can't access the internet via a browser at the same time. They can both still ping, use Skype etc but can't browse. As soon as the one that can browse exits the network browsing returns for the other and vice versa. As ping and Skype was working I assumed some kind of DNS problem but moving over to OpenDNS didn't solve it, nor did restarting networking or using wired rather than wireless. We also switched out the router, and it still persisted so I'm sure this isn't a network issue. The two clients are both laptops and work fine together on a wireless network at another office (which we don't control). I'm thinking something must be cached from the other network they both use that's causing this but have no idea what. Does anyone have any ideas? I just don't know where to go from here.

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• Do memory cards have any max file size limitation?

  - by Dmitriy R

  I am not sure where to ask this question, so perhaps it is physical limitation. I have a 8 GB flash micro SD memory card. When I copy any file size of up to few gigabytes, copying happens normally. But if I am trying to copy file over 4 GB file, then the system tells me like insufficient memory on card, although 8 GB is available. So perhaps only 32 bit address is used for keeping size of file in micro SD card, or is my micro SD defective?

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