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  • Parallel processing from a command queue on Linux (bash, python, ruby... whatever)

    - by mlambie
    I have a list/queue of 200 commands that I need to run in a shell on a Linux server. I only want to have a maximum of 10 processes running (from the queue) at once. Some processes will take a few seconds to complete, other processes will take much longer. When a process finishes I want the next command to be "popped" from the queue and executed. Does anyone have code to solve this problem? Further elaboration: There's 200 pieces of work that need to be done, in a queue of some sort. I want to have at most 10 pieces of work going on at once. When a thread finishes a piece of work it should ask the queue for the next piece of work. If there's no more work in the queue, the thread should die. When all the threads have died it means all the work has been done. The actual problem I'm trying to solve is using imapsync to synchronize 200 mailboxes from an old mail server to a new mail server. Some users have large mailboxes and take a long time tto sync, others have very small mailboxes and sync quickly.

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  • Bash scripting problem

    - by komidore64
    I'm writing a bash script to sync my iTunes music directory to a directory on a removable hard drive. The script works fine when there is absolutely nothing in the folder on the external hard drive. Once all files have been copied to the external drive, then the script begins to act strange. Even though i just sync'd everything over, it proceeds to recopy certain files again. After the initial sync, it chooses the same files to resync each consecutive time the script is executed without any changes being made to the source directory. #!/bin/bash # shell script to sync music with gigabeat and/or firewire drive musicdir="/Users/komidore64/Music/iTunes/iTunes Media/Music" gigadir="/Volumes/GIGABEAT/music" # fwdir="/Volumes/" remove() { find "$1" \ ! \( -name "*.wav" \ -o -name "*.ogg" \ -o -name "*.flac" \ -o -name "*.aac" \ -o -name "*.mp3" \ -o -name "*.m4a" \ -o -name "*.wma" \ -o -name "*.m4p" \ -o -name "*.ape" \ -o -type d \) \ -exec rm -i {} \; } if [ $# == 0 ]; then echo "no device argument present" echo "specify '-g' for gigabeat" echo "or '-f' for firewire drive" else remove "$musicdir" while [ $1 ]; do case $1 in -g | --gigabeat ) rsync --archive --verbose --delete "$musicdir/" "$gigadir" ;; -f | --firewire ) rsync --archive --verbose --delete "$musicdir/" "$fwdir" esac shift done echo "music synced" fi

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  • Parsing the output of "uptime" with bash

    - by Keek
    I would like to save the output of the uptime command into a csv file in a Bash script. Since the uptime command has different output formats based on the time since the last reboot I came up with a pretty heavy solution based on case, but there is surely a more elegant way of doing this. uptime output: 8:58AM up 15:12, 1 user, load averages: 0.01, 0.02, 0.00 desired result: 15:12,1 user,0.00 0.02 0.00, current code: case "`uptime | wc -w | awk '{print $1}'`" in #Count the number of words in the uptime output 10) #e.g.: 8:16PM up 2:30, 1 user, load averages: 0.09, 0.05, 0.02 echo -n `uptime | awk '{ print $3 }' | awk '{gsub ( ",","" ) ; print $0 }'`","`uptime | awk '{ print $4,$5 }' | awk '{gsub ( ",","" ) ; print $0 }'`","`uptime | awk '{ print $8,$9,$10 }' | awk '{gsub ( ",","" ) ; print $0 }'`"," ;; 12) #e.g.: 1:41pm up 105 days, 21:46, 2 users, load average: 0.28, 0.28, 0.27 echo -n `uptime | awk '{ print $3,$4,$5 }' | awk '{gsub ( ",","" ) ; print $0 }'`","`uptime | awk '{ print $6,$7 }' | awk '{gsub ( ",","" ) ; print $0 }'`","`uptime | awk '{ print $10,$11,$12 }' | awk '{gsub ( ",","" ) ; print $0 }'`"," ;; 13) #e.g.: 12:55pm up 105 days, 21 hrs, 2 users, load average: 0.26, 0.26, 0.26 echo -n `uptime | awk '{ print $3,$4,$5,$6 }' | awk '{gsub ( ",","" ) ; print $0 }'`","`uptime | awk '{ print $7,$8 }' | awk '{gsub ( ",","" ) ; print $0 }'`","`uptime | awk '{ print $11,$12,$13 }' | awk '{gsub ( ",","" ) ; print $0 }'`"," ;; esac

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  • Bash mine script, please

    - by HomelyPoet
    The script, in and of its self, is fairly self-explanatory. Use if You so desire; any and all criticism wouldst be appreciated, as wouldst any suggestions for improvement. First iteration was writ upon OS X 10.5.8 Leopard, current iteration was run upon OS X 10.6.4 Snow Leopard with Safari 5.0.2 (6533.18.5). Also, any illumination as to why the first line ' if [ -f ] ' works, but ' if [ -f ~/Library/Safari/LocalStorage/*.localstorage ] ' generates an error? [yes, I am a bit of a Noob] Code: #! /bin/bash # SafariClear0.0.6 if [ -f ] then cat /dev/null > ~/Library/Safari/LocalStorage/*.localstorage rm -f ~/Library/Safari/LocalStorage/*.localstorage fi if [ -f ~/Library/Safari/LocalStorage/*.localstorage ] then echo "Oy vey!" fi cd ~/Library/Safari/ cat /dev/null > WebpageIcons.db cat /dev/null > TopSites.plist cat /dev/null > LocationPermissions.plist cat /dev/null > LastSession.plist cat /dev/null > History.plist echo "Clear" exit

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  • Server Bash Line Wrapping Over Text & In Wrong Place

    - by Pez Cuckow
    This is quite a hard problem to explain, when connecting to one of my servers using the bash shell, under any user the line wrapping is broken and has all sorts of problems. Once of which I detail in screenshots below: Other problems I experience include nano getting very confused about which line and or letter I am on, as shown by typing the same message into nano: These problems only occur when connecting as I previously mentioned to one of my servers which runs CentOs. Do you know why this is occurring and what I can do to fix it? On other servers the message works fine! Thanks for your time, Output of requested commands: Server that doesn't work properly: Working server: Could it perhaps be the custom prompt on the non working server? In .bashrc PS1='\e[1;32m\u@\h\e[m:\e[1;34m\w\e[m$ ' Commenting this out appeared to resolve the problem. Google says line wrapping errors can occur if you don't conform to these rules use the \[ escape to begin a sequence of non-printing characters, and the \] escape to signal the end of such a sequence I am not sure where this would fit in on my prompt?

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  • Bash script dosn't open in terminal on reboot

    - by twigg
    Quick overview, I have created a script that reboots the laptop after x amount of time and x amount of cycles. I have added the script to the start-up applications and the script does seem to be running in the background but never opens a terminal Window. Am I missing something? Adding Code (this is saved in a file called countdown.sh) #!/bin/bash # check if passed.txt exists if it does, send to soak test if [ -f passed.txt ]; then echo reboot has passed $nol cycles sleep 5; echo Starting soak tests sleep 5; rm testlog.txt; rm passed.txt; phoronix-test-suite run quick-test exit 0; fi # check if file testlog.txt exists if not create it if [ ! -f testlog.txt ]; then echo >> testlog.txt; fi # read reboot file to see how many loops have been completed exec < testlog.txt nol=0 while read line do nol=`expr $nol + 1` done # start the countdown, x is time limit let x=10; while [ $x -gt 0 ]; do clear; figlet "Rebooting in..."; figlet $x; let x-=1; sleep 1; done; echo reboot success $nol >> testlog.txt; shutdown -r now; # set how many times the script should shutdown the laptop reboot_count=1 # if number of reboots matches nol's then stop the script # create a new text file called passed.txt if [ "$nol" == "$reboot_count" ]; then echo reboot passed $nol cycles >> passed.txt; fi

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  • How do I hook into Tar with BASH?

    - by orb
    Long Story Short I am working with Tar archives that contain PNG images in base64 encoding. I would like to use BASH (or whatever else works) to hook into the extraction function of Tar to decode PNG images from base64 encoding to standard PNG encoding after the files are unpacked. A simple cat $input-file | base64 -d >$output-file will successfully decode the images. Is there a way I can hook into tar -xf so that users do not have to do any (or minimal) extra work to decode the images? In the GNU Tar documentation (http://www.gnu.org/software/tar/manual/html_chapter/Backups.html#SEC97) I found that there are in fact variables reserved to hold the names of functions I desire to be hooked into various moments in Tar program execution. However, the documentation explains that these variables, along with other variables that can be set to configure Tar, are located in a file named backup-specs. Unfortunately, the path to this file is not given. Further, running sudo find / -name backup-specs tells me that this file is not present on my Ubuntu version 13.04 system. Background Information not included in the Long Story Short I have been working on a browser-based (WebGL) particle effect creation application (http://www.particleeffect.org), (https://github.com/cgrabowski/webgl-particle-effect-editor), (https://github.com/cgrabowski/webgl-particle-effect). I have began to write a client-side-only solution for saving and loading effect data as a tar archive. However, since client-side JavaScript has limited capability to process binary data, the images used as textures in the effect are saved with base64 encoding. I have been able to implement saving effect data as a Tar archive (haven't pushed that to Github yet). However, the images present in said Tar archive cannot be manipulated unless they are decoded from base64 encoding.

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  • Environment variables in bash_profile or bashrc?

    - by Viriato
    I have found this question [blog]: Difference between .bashrc and .bash_profile very useful but after seeing the most voted answer (very good by the way) I have further questions. Towards the end of the most voted, correct answer I see the statement as follows : Note that you may see here and there recommendations to either put environment variable definitions in ~/.bashrc or always launch login shells in terminals. Both are bad ideas. Why is it a bad idea (I am not trying to fight, I just want to understand)? If I want to set an environment variable and add it to the PATH (for example JAVA_HOME) where it would be the best place to put the export entry? in ~/.bash_profile or ~/.bashrc? If the answer to question number 2 is ~/.bash_profile, then I have two further questions: 3.1. What would you put under ~/.bashrc? only aliases? 3.2. In a non-login shell, I believe the ~/.bash_profile is not being "picked up". If the export of JAVA_HOME entry was in bash_profile would I be able to execute javac & java commands? Would it find them on the PATH? Is that the reason why some posts and forums suggest setting JAVA_HOME and alike to ~/.bashrc? Thanks in advance.

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  • Refresh devices - reconnect CF card drive by script (unplug-plug equivalent)

    - by Chris
    Hello I plug a completely clean CF-card into my USB card-writer. Then I dd a mbr block of 512 bytes size to the device, which contains the partition table and the definition of one partition. Problem: While "fdisk -l /dev/sdx" correctly displays the partition, it happens that there is no device like "/dev/sdx1" after these operations (as it was not present before). Unplugging and plugging the card-writer solves the problem and makes the device(s) appear. Since I use this procedure in a script, manually unplugging and re-plugging is no option whatsoever. Is there a way to "refresh" the devices or to "unplug and re-plug" the drive by script such that /dev/sdx1 appears? Thanks for any help, Chris

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  • Passing two arguments to a command using pipes

    - by firebat
    Usually, we only need to pass one argument: echo abc | cat echo abc | cat some_file - echo abc | cat - some_file Is there a way to pass two arguments? Something like {echo abc , echo xyz} | cat cat `echo abc` `echo xyz` I could just store both results in a file first echo abc > file1 echo xyz > file2 cat file1 file2 But then I might accidentally overwrite a file, which is not ok. This is going into a non-interactive script. Basically, I need a way to pass the results of two arbitrary commands to cat without writing to a file. UPDATE: Sorry, the example masks the problem. While { echo abc ; echo xyz ; } | cat does seem to work, the output is due to the echos, not the cat. A better example would be { cut -f2 -d, file1; cut -f1 -d, file2; } | paste -d, which does not work as expected. With file1: a,b c,d file2: 1,2 3,4 Expected output is: b,1 d,3 RESOLVED: Use process substitution: cat <(command1) <(command2) Alternatively, make named pipes using mkfifo: mkfifo temp1 mkfifo temp2 command1 > temp1 & command2 > temp2 & cat temp1 temp2 Less elegant and more verbose, but works fine, as long as you make sure temp1 and temp2 don't exist before hand.

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  • How to automatically execute a shell script when logging into Ubuntu

    - by Mike Rowave
    How do I get a script to execute automatically when I log in? Not when the machine starts up, and not for all users, but only when I (or any specific user with the script) login via the GNOME UI. From reading elsewhere I thought it was .bash_profile in my home directory, but for me it has no effect. When I manually execute it in a terminal window by typing ~/.bash_profile it works, but it won't run automatically when I log in. I'm running Ubuntu 11.04. The file permission on my .bash_profile is -rwx------. No .bash_profile existed in my home directory before I created it today. I seem to remember older versions of Linux having a .profile file for each user, but that doesn't work either. How is it done? Do I need to configure something else to get the .bash_profile to work? Or does the per-user login script need to be in some other file?

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  • Creating a scripting language

    - by j-t-s
    Hi All Can somebody please guide me in the right direction of creating a scripting language that targets the WSH (Windows Scripting Host)? I have googled for it, but there seem to be far fewer links related to this than when I originally searched for it a few months back. THank you

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  • php vs bash for CLI scripting?

    - by fayer
    i have never used PHP with CLI, but i have seen scripts run with php code. i was wondering, why should we use bash, when php is so popular and is able to run in CLI. what are the pros and cons with each one? should i use php for all CLI scripting in the future?

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  • Embedding a scripting engine in C++

    - by Jen
    I'm researching how to best extend a C++ application with scripting capability, and I am looking at either Python or JavaScript. User-defined scripts will need the ability to access the application's data model. Have any of you had experiences with embedding these scripting engines? What are some potential pitfalls?

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  • Cocoa Scripting Bridge and <contents> element

    - by Stephen
    So, the application I'm trying to script has a scripting definition file that includes a <contents> element, which is an "implicitly specified container." The question, how do I get at what's inside this element using Scripting Bridge? Or alternatively, how do I send the Apple Event necessary to retrieve it and then transform what I get back into an SBObject? I already tried: [document nameOfKey] document.nameofKey [document contents] document.contents

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  • Cross site scripting help?

    - by shane87
    I have a piece of javascript executing on a jetty server which is sending a XMLHTTPRequest to a scoket on another server(wamp server). The request gets sent to the socket, however the XHR response seems to be getting blocked. My only thoughts on this is it may be an issue with XSS(cross site scripting). Is there a way in which i could enable cross site scripting for this particular request or is there something else i should be doing? Any help would be greatly appreciated!

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  • C++ Expose Already Existing Instance of Objects to a Scripting Language

    - by user947871
    So, I want to be able to modify already instanced C++ objects in a scripting language. I have been looking at Lua with LuaBind and Python with SWIG or Boost::Python, but all I see is how to make new instances of the objects, but I want to modify already existing ones. Example: C++: Player playerOne = new Player(); Scripting Language : playerOne.Transform.x += 5; Is this possible, and if so, wat would you suggest as a good Language/library to achieve this with?

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  • How do I detect if I'm in a 'full screen' bash shell or GUI terminal window?

    - by Nick T
    I have some code in my .bashrc that sets the terminal window title using the currently running command and it works great in Unity, where the terminal is in a window. However, when I'm logging in with the Ctrl + Alt + F1 terminal (whatever it's called), my prompt gets filled with garbage that is various escape sequences that set the (nonexistent) window title. How can I detect from within a bash script if I'm in one or the other?

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  • VCPASS: Extend your T-SQL Scripting with PowerShell

    - by dbaduck
    Date: November 16, 2011 Extend your T-SQL Scripting with PowerShell Description: I'll be covering some of the different way we can use PowerShell to extend our T-SQL scripting. This session will include a mix of using SMO, .NET classes, and SQLPS to help you understand the power for new scripting technology. At the end we’ll be creating a solution that put together all this techniques. Date/Time: 11/16/2011 1:00 PM - 2:00 PM EST Registration Link: https://www.livemeeting.com/lrs/8000181573/Registration.aspx?pageName=7wzjxg98v9160twm...(read more)

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