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  • parsing the output of the 'w' command?

    - by Blackbinary
    I'm writing a program which requires knowledge of the current load on the system, and the activity of any users (it's a load balancer). This is a university assignment, and I am required to use the w command. I'm having a hard time parsing this command because it is very verbose. Any suggestions on what I can do would be appreciated. This is a small part of the program, and I am free to use whatever method i like. The most condensed version of w which still has the information I require is `w -u -s -f' which produces this: 10:13:43 up 9:57, 2 users, load average: 0.00, 0.00, 0.00 USER TTY IDLE WHAT fsm tty7 22:44m x-session-manager fsm pts/0 0.00s w -u -s -f So out of that, I am interested in the first number after load average and the smallest idle time (so i will need to parse them all). My background process will call w, so the fact that w is the lowest idle time will not matter (all i will see is the tty time). Do you have any ideas? Thanks (I am allowed to use alternative unix commands, like grep, if that helps).

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  • Run a command as cron would but from the command line.

    - by BCS
    I have a script that I'm trying to run from cron. When I run it from bash, it work just fine. However when I let cron do it's thing, I get a: myscript.sh: line 122: syntax error: unexpected end of file What I want is a way to run a command as if it was a cron job, but do it in my shell. As a side note: does anyone know what would be differnt under cron? (the script already has a #!/bin/sh line) To answer my own question: I added this to my crontab: * * * * * bcs for ((i=1; i <= 55; i++)) ; do find ~/.crontemp/ -name '*.run' -exec "{}" ";" ; sleep 1; done` and created this script: #!/bin/sh tmp=$(mktemp ~/.crontemp/cron.XXXXX) mknod $tmp.pipe p mv $tmp $tmp.pre echo $* '>' $tmp.pipe '1>&2' >> $tmp.pre echo rm $tmp.run >> $tmp.pre chmod 700 $tmp.pre mv $tmp.pre $tmp.run cat $tmp.pipe rm $tmp.pipe With that, I can run an arbitrary command with a delay of not more than one second. (And yes, I know there are all kinds of security issue involved in that)

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  • MacVim, Command-T: SEGV

    - by Ramon Tayag
    Details: OSX 10.7.4 I installed the latest MacVim via Homebrew: $ command-t brew install macvim ==> Downloading https://github.com/b4winckler/macvim/tarball/snapshot-64 Already downloaded: /Library/Caches/Homebrew/macvim-7.3-64.tgz ==> ./configure --with-features=huge --with-tlib=ncurses --enable-multibyte --with-macarchs=x86_64 --enable-perlinterp --enable-pythoninterp --enable-rubyinterp --enable-t ==> make getenvy ==> make ==> Caveats MacVim.app installed to: /usr/local/Cellar/macvim/7.3-64 To link the application to a normal Mac OS X location: brew linkapps or: ln -s /usr/local/Cellar/macvim/7.3-64/MacVim.app /Applications ==> Summary /usr/local/Cellar/macvim/7.3-64: 1733 files, 27M, built in 53 seconds $ command-t brew linkapps Linking /usr/local/Cellar/macvim/7.3-64/MacVim.app Finished linking. Find the links under ~/Applications. $ command-t ruby -v ruby 1.8.7 (2011-12-28 patchlevel 357) [universal-darwin11.0] $ command-t rvm list rvm rubies ree-1.8.7-2012.02 [ i686 ] ruby-1.8.7-p358 [ i686 ] ruby-1.9.2-p290 [ x86_64 ] ruby-1.9.2-p320 [ x86_64 ] ruby-1.9.3-p194 [ x86_64 ] # Default ruby not set. Try 'rvm alias create default <ruby>'. # => - current # =* - current && default # * - default $ command-t cd ~/.vim/bundle/vim-command-t/ruby/command-t ruby extconf.rb $ command-t ruby extconf.rb checking for ruby.h... yes creating Makefile $ command-t make cc -arch i386 -arch x86_64 -pipe -bundle -undefined dynamic_lookup -o ext.bundle ext.o match.o matcher.o -L. -L/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib -L. -arch i386 -arch x86_64 -lruby -lpthread -ldl -lobjc ld: warning: ignoring file ext.o, file was built for unsupported file format which is not the architecture being linked (i386) ld: warning: ignoring file match.o, file was built for unsupported file format which is not the architecture being linked (i386) ld: warning: ignoring file matcher.o, file was built for unsupported file format which is not the architecture being linked (i386) $ command-t mvim MacVim then opens here. But when I open Command-T, MacVim crashes and I see this in the command line: $ command-t dyld: lazy symbol binding failed: Symbol not found: _rb_intern2 Referenced from: /Users/ramon/.vim/bundle/vim-command-t/ruby/command-t/ext.bundle Expected in: flat namespace dyld: Symbol not found: _rb_intern2 Referenced from: /Users/ramon/.vim/bundle/vim-command-t/ruby/command-t/ext.bundle Expected in: flat namespace Vim: Caught deadly signal TRAP Vim: Finished. The problem I have is very similar to this, except that I switched to the system Ruby and still got the error.

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  • Xcode "Build and Archive" from command line

    - by Dan Fabulich
    Xcode 3.2 provides an awesome new feature under the Build menu, "Build and Archive" which generates an .ipa file suitable for Ad Hoc distribution. You can also open the Organizer, go to "Archived Applications," and "Submit Application to iTunesConnect." Is there a way to use "Build and Archive" from the command line (as part of a build script)? I'd assume that xcodebuild would be involved somehow, but the man page doesn't seem to say anything about this.

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  • add a start up item via command line (mac)

    - by adam n
    How can I add a start up item via command line on a mac? From googling, I know you have to edit ~/Library/Preferences/com.apple.loginitems.plist using defaults write com.apple.loginitems [key] [value] but i'm not sure exactly which things to edit.

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  • How to handle crash from system command in Perl on windows

    - by Pete
    I am calling a command-line program from my perl script, when these programs crash, I am prompted with a messagebox asking me if I want to notify Microsoft. Since this is an automated system it would be desirable if I could suppress that message and continue with other things in my script. Is this possible?

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  • how to start growl via the command line

    - by adam n
    I have a bash script that uses growlnotify to send notifications. However, growlnotify doesn't work if Growl isn't already running, and it won't auto start Growl if it needs it, either. So I want to be able to check if Growl is running, and then start it if it isn't. I'm thinking of doing something like: g=$(ps -e | grep Growl | grep -v grep) if [ -z "$g" ] # Growl isn't running then # (start Growl) fi How would I start Growl via the command line?

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  • dos command flex core

    - by msaif
    can i execute some dos like command from flex just like attrib c:\a.txt -h. function available in c exec(), in java Runtime.getRuntime().exec(). but in flex is there any available?

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  • Java: Using Command line arguments to process the names of files

    - by Kat
    I'm a writing a program that will determine the number of lines, characters, and average word length for a text file. For the program, the specifications say that the file or files will be entered as a command line argument and that we should make a TestStatistic object for each file entered. I don't understand how to write the code for making the TestStatistic objects if the user enters more than one file.

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  • Batch File - REN command's ErrorLevel returns 0 even on failure

    - by FMFF
    This is related to my earlier question. ren "C:\Temp\%%A" "C:\Temp\%%A" if errorlevel 0 ( "C:\Program Files\7-Zip\cmdline\7za.exe" a -tzip -mx9 "C:\temp\Zip\%%A.zip" "C:\temp\%%A" Move "C:\temp\%%A" "C:\Temp\Archive" ) In the above, the IF evaluates to true always, even if REN command fails. The idea is to check if a file is not locked by any other application, if not then Archive it and move it elsewhere. How best to do this? Thank you.

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  • Command line semaphore utility

    - by compie
    I want to write a command line utility that can be used to synchronize the execution off programs in different consoles. Console A: $ first_program && semaphore -signal Console B: $ semaphore -wait && second_program The first program takes a long take to complete. The second program can only start when the first program has finished. Which synchronization object do I need to implement this (in Python)?

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  • Exit to command line in Python

    - by fuenfundachtzig
    I have a script that I want to exit early under some condition: if not "id" in dir(): print "id not set, cannot continue" # exit here! # otherwise continue with the rest of the script... print "alright..." [ more code ] I run this script using execfile("foo.py") from the Python interactive prompt and I would like the script to exit going back to the command line. How do I do this? If I use sys.exit(), the Python interpreter exits completely.

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  • php,unix command ,imagick

    - by user345804
    This is unix command -t "SOME BULGEBOTTOM TEXT" -s outline -e bulge-bottom -d 0.5 -f Arial -p 48 -c skyblue -b white -o black -l 1 -u lightpink system('-t \'SOME BULGEBOTTOM TEXT\' -s outline -e bulge-bottom -d 0.5 -f Arial -p 48 -c skyblue -b white -o black -l 1 -u lightpink'); in php it is not working

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  • Python run command line (time)

    - by pns
    Hi, I want to run the 'time' unix command from a Python script, to time the execution of a non Python app. I would use the os.system method. Is there any way to save the output of this in Python? My goal is to run the app several times, save their execution times and then do some statistics on them. Thank You

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