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  • Problems when loop over a series of ssh-ed commands

    - by Jack Medley
    I have a series of server machines which I want to run the same command on. Each command takes hours and (even though I am running the commands using nohup and setting them to run in the background) I have to wait for each to finish before the next starts. Here is roughly how I have set it up: On the host machines: for i in {1..9}; do ssh RemoteMachine${i} ./RunJobs.sh; done Where RunJobs.sh on each remote machine is: source ~/.bash_profile cd AriadneMatching for file in FileDirectory/Input_*; do nohup ./Executable ${file} & done exit Does anyone know of a way such that I dont have to wait for each job to finish before the next starts? Or alternatively a better way of doing this, I have a feeling what I am do is fairly sub-optimal. Cheers, Jack

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  • Run command before and after printing with CUPS?

    - by leto
    Hello, this is a home setup. A central printer server (Linux) manages the queue, a HP 2430DTN is attached to it via 100Mbit/sec Ethernet. The printer is hooked up to a managable power source. A shell script watches the queue on the server (lpstat -o) and turn on the printer when there is a job. If the queue is empty for 10 minutes it turns the printer off. Now this setup messes up, stops the printer etc. after a couple of weeks and is in general "not so reliable". I now know how to change the stop-printer thing, but: Is there a way to run my turn printer on script and turn printer off script directly from cups without watching the queue? That would be so cool!

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  • How to get the pid of a running process using a single command that parse the output of ps?

    - by Sorin Sbarnea
    I am looking for a single line that does return the pid of a running process. Currently I have: ps -A -o pid,cmd|grep xxx|head -n 1 And this returns the fist pid, command. I need only the first number from the output and ignore the rest. I suppose sed or awk would help here but my experience with them is limited. Also, this has another problem, it will return the pid of grep if the xxx is not running. It's really important to have a single line, as I want to reuse the output for doing something else, like killing that process.

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  • Add entire 300 GB filesystem to Git Annex repository?

    - by Ryan Lester
    By default, I get an error that I have too many open files from the process. If I lift the limit manually, I get an error that I'm out of memory. For whatever reason, it seems that Git Annex in its current state is not optimised for this sort of task (adding thousands of files to a repository at once). As a possible solution, my next thought was to do something like: cd / find . -type d | git annex add --$NONRECURSIVELY find . -type f | git annex add # Need to add parent directories of each file first or adding files fails The problem with this solution is that there doesn't seem from the documentation to be a way to non-recursively add a directory in Git Annex. Is there something I'm missing or a workaround for this? If my proposed solution is a dead end, are there other ways that people have solved this problem?

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  • Messy Filesytem : Duplicate File Removal from the command line

    - by jrause
    In debian/ubuntu I want to a) create a list of all the files in one directory tree b) do the same for a second directory tree c) compare the two lists such that, only the file NAMES are compared (i.e. just comparing the "file.txt" part so that "/home/folder/file.txt" == "/home/secondfolder/folder/file.txt) d) output a list of all the duplicates can anyone please explain how to do this using scripting languages or regex or something?

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  • Can't access Terminal anymore, only shows a cursor

    - by user138304
    I run OS X. Following these directions (Installing MySQL on Mac OS X) I added a file to /usr and the contents were PATH=/usr/local/mysql/bin:$PATH Actually I was trying to get the mysql command to work now I cannot access terminal. All I get is a cursor but no command line. I also cannot find the file I created in the Finder. I used command shift G to find the folder /usr and the file is not there. Edit: I Solved the problem by restarting my computer. I am really not sure what the problem was. I got the idea because Could not open a new pseudo-tty. appeared in my terminal after following slhck directions to remove my .profile file. I then searched google and found this; http://blogs.oreilly.com/digitalmedia/2008/03/fixing-terminal-tty-errors.html. Thanks

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  • How do I change the .bash_history file location?

    - by Brian Graham
    I'm running CentOS 6.x and want to move the .bash_history to a different location. The home directories of my users are (because I run a VPS) in /var/www/vhost/<domain>.<tld> which is FTP accessible (and it should be). Because of this, I have changed the AuthorizedKeysFile for SSH connections out of the normal ~/.ssh/authorized_keys since FTP connections would easily be able to locate them. At the same time I want to move the .bash_history file to /home/%u/.bash_history where %u is the current user.

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  • SAFE MODE Restriction in effect. The script not allowed to access directory owned by uid

    - by user57221
    I am running a dedicated server with multiple websites. I have created a global directory for common scripts for all websites, rather than repeating them in every website directory. How can I make this global directory accessible for all website. I am getting following error. Warning: require_once() [function.require-once]: SAFE MODE Restriction in effect. The script whose uid is XXXX is not allowed to access /vhosts/globallibrary/Zend/Application.php owned by uid XXXX I have change the ownership of global directory for X website. so it works fine for X website. latter I added another website Y Now I am getting the same error again. If I change the CHOWN for Y website then X website will have the same error. I don't want to disable the safemode restriction. Is there a work around, so that this global dir will be accessible by all website. I am getting following error in my browser when I try to access global directory. Global directory is on same level as all other websites. Is this a good practice to enable safemode for websites?

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  • Use msysgit/"Git for Windows" to navigate Windows shortcuts?

    - by Darthfett
    I use msysgit on Windows to use git, but I often want to navigate through a Windows-style *.lnk shortcut. I typically manage my file structure through Windows' explorer, so using a different type of shortcut (such as creating hard or soft link in git) isn't feasible. How would I navigate through this type of shortcut? For example: PCUser@PCName ~ $ cd Desktop PCUser@PCName ~/Desktop $ ls Scripts.lnk PCUser@PCName ~/Desktop $ cd Scripts.lnk sh.exe": cd: Scripts.lnk: Not a directory Is it possible to change this behavior, so that instead of getting an error, it just goes to the location of the directory? Alternatively, is there a command to get the path in a *.lnk file?

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  • looping .mpeg dump

    - by Matt Cook
    Need to dump an MPEG2 file in a loop, either to stdout or a named pipe. This works: $ { while : ; do cat myLoop.mpg; done; } | vlc - This works on a text file containing "1234\n": $ mkfifo myPipe $ cat test.txt > myPipe & < myPipe tee -a myPipe | cat - (it correctly loops, outputting "1234" on every line). Why does the following NOT work? $ cat myLoop.mpg > myPipe & < myPipe tee -a myPipe | vlc myPipe I'm primarily interested in re-writing the first statement to remove the improper "cat myLoop.mpg" statement. Will be inputting into VLC, or into FFMPEG and then piped into VLC.

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  • Avoiding users to corrupt and use a script

    - by EverythingRightPlace
    Is it possible to deny the right to copy files? I have a script which should be executable by others. They are also allowed to read the file (though it would not be a problem to forbid reading). But I don't want the script to be changed and executed. It's not a problem to set those permissions, but one could easily copy, change and run the script. Can this even be avoided? /edit The OS is Red Hat Enterprise Linux Workstation release 6.2 (Santiago).

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  • Is it possible to code on two different computers simultaneously?

    - by Muhammad
    I want to work with another programmer and I want the source code to be live in real-time on both of our screens. Is this possible on the Mac OS x or Linux? We're going to be using OS X but occasionally we might need to add an Ubuntu computer too. Is there a way I can do this using ssh, any shell based program, or even a good GUI? I thought Coda might be capable of this but it's not really working. Anyone ever do this? I'm not look for a git/svn/or any other version control system. This is more of a live coding session. :)

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  • Is there a unix command to output time elapsed during a command?

    - by Olivier Lacan
    I love using time to find out how long a command took to execute but when dealing with commands that execute sub-commands internally (and provide output that allows you to tell when each of those sub-commands start running) it would be really great to be able to tell after what number of seconds (or milliseconds) a specific sub-command started running. When I say sub-command, really the only way to distinguish these from the outside is anything printed to standard out. Really this seems like it should be an option to time.

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  • Create keyboard shortcuts to move/resize windows in Ubuntu

    - by Herms
    On windows I have a few AutoHotkey scripts that let me hit various key combinations to resize windows to particular pre-defined sizes, or move them to certain areas of the screen (or both). I'm wondering how I would accomplish this in Ubuntu (gnome). Most of the searches I did for a linux version of autohotkey seemed to be centered around just setting up simple keyboard shortcuts (key combo X launches app Y, etc). I didn't see anything about scripting window size and placement beyond maximize/minimize.

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  • Diff and ignore lines missing in one file

    - by Millianz
    I want to diff two files and ignore lines that are present in one file but missing in the other. For example File1: foo bar baz bat File2: foo ball bat I'm currently running the following diff command diff File1 File2 --changed-group-format='%>' --unchanged-group-format='' Which in this case would produce bar baz as the output, i.e. only missing or conflicting lines. I would like to only print conflicting lines, i.e. ignore cases where one line is missing from File2 and is present in File1 (not the other way around). Is there any way to do something like this using diff or do I have to resort to other tools? If so, what would you recommend?

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  • Do background processes get a SIGHUP when logging off?

    - by Massimo
    This is a followup to this question. I've run some more tests; looks like it really doesn't matter if this is done at the physical console or via SSH, neither does this happen only with SCP; I also tested it with cat /dev/zero > /dev/null. The behaviour is exactly the same: Start a process in the background using & (or put it in background after it's started using CTRL-Z and bg); this is done without using nohup. Log off. Log on again. The process is still there, running happily, and is now a direct child of init. I can confirm both SCP and CAT quits immediately if sent a SIGHUP; I tested this using kill -HUP. So, it really looks like SIGHUP is not sent upon logoff, at least to background processes (can't test with a foreground one for obvious reasons). This happened to me initially with the service console of VMware ESX 3.5 (which is based on RedHat), but I was able to replicate it exactly on CentOS 5.4. The question is, again: shouldn't a SIGHUP be sent to processes, even if they're running in background, upon logging off? Why is this not happening? Edit I checked with strace, as per Kyle's answer. As I was expecting, the process doesn't get any signal when logging off from the shell where it was launched. This happens both when using the server's console and via SSH.

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  • Linux file copy with ETA?

    - by bobby
    I'm copying a large amount of files between disks. There's approximately 16 GB of data. I'd like to see progress information, and even an estimated time of completion from the command line. Any advice?

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  • UDISKS instead of HAL

    - by MeJ
    Does anybody have some expirence with udisks, because HAL won't be longer supported on the most linux distribution, so I am thinking of to use udisks for UDI in $(hal-find-by-property --key storage.bus --string usb) do HAL_TMP=`hal-get-property --udi $UDI --key storage.removable.media_available` if [ "$HAL_TMP" = "true" ]; then HAL_DEV=$(hal-get-property --udi $UDI --key block.device) HAL_SIZE=$(hal-get-property --udi $UDI --key storage.removable.media_size) HAL_TYPE=$(hal-get-property --udi $UDI --key storage.drive_type) How do I have to adapt the above mentioned commands but use udisks instead of hal Thanks!

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  • Tab Auto-Completion in Mac OS X when using sftp in terminal

    - by AlanTuring
    i have been getting very frustrated lately since the readline functionality has been removed from MacOSX and Tab Auto-Completion doesn't work anymore. So i was wondering if anyone knew a good alternative to use that i could install so i can tab auto-complete files when sftp'd in. I heard that with-readline is a good option for this. If so, how do i get an alias sftp = with-readline sftp to work? I would like to do the same with any other option that isn't with-readline, so i don't have to assign an alias each time i set up a session. I am using Mac OS X 10.8(Mountain Lion) with Homebrew installed. Thanks in advance to anyone who can help me.

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