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  • UTF-8 and !# shell scripts

    - by sal
    Is there a way to configure bash on Linux (red hat and ubuntu) to allow shell scripts to be encoded in UTF-8? I can't find a simple way to change just one little thing and have the whole system just use UTF-8 files without having to worry about encoding.

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  • 'less' doesn't clear screen after quit

    - by Dana
    The default behavior for 'less' is to clear the screen after quitting. This behavior stopped when I started using: export TERM=xterm Now 'less' leaves the last page I viewed on the screen, and I want to re-enable the default behavior of clearing the screen. Googling this problem I found that people use the following command in their ~/.screenrc: altscreen on I'm not sure if this is a mac-issue but I don't have this command available. I'm using bash shell on Mac terminal. Thanks!

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  • What's the easiest way to 'cat' groups of files together?

    - by rajitha
    I have files with naming convention of this pattern: bond_7.LEU.CA.1.dat bond_7.LEU.CA.2.dat bond_7.LEU.CA.3.dat bond_12.ALA.CB.1.dat bond_12.ALA.CB.2.dat bond_12.ALA.CB.3.dat ... I want to concatenate all files of the same group into a single one. For example: cat bond_7.LEU.CA.*.dat > ../bondvalues/bond_7.LEU.CA.1_3.dat There's large number of these files. How can achieve this with a bash script?

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  • Evaluate cron expression

    - by Jake A. Smith
    Is there a command line tool that will simply evaluate a cron expression and return a bool response if it is supposed to be running right now? I'm looking for something I can use as a utility in another bash script. Something like so: run_script=$(/tools/evaluate-cron-expression "02 4 * * *") if [ "$run_script" -eq "1" ] # etc etc I know, I know, I could just setup a real cron job, but I'm playing with the idea of wrapping all of my scheduled scripts inside of another script.

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  • Prevent "^C" from being printed when aborting editing current prompt

    - by blueyed
    When you're editing a prompt in bash, and then press Ctrl-C to abort it, "^C" might get printed where the cursor has been. When you were in the middle of the line, this makes copy'n'pasting more difficult and IIRC it can be configured to not display it (and overwrite parts of the command line). I do not have this problem myself (using zsh, which does not print "^C"), but ran across this in a Konsole bug report.

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  • Open application with lowered privileges

    - by GP89
    I have a mac installer which runs as root with pre and post install bash scripts. At the end of the post install script I launch the application which inherits and opens as root. Is there a way I can lower the permissions back down to the user that ran the installer and then open the app? Or a more hackish way I can set the app to open in some scheduler from the script, which then gets opened by the scheduler which would have the users permissions

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  • How to run a program and get its PID in the background

    - by Ivan
    I have a Minecraft server startup script that looks like this: #!/bin/bash cd "$(dirname "$0")" exec java -Xmx4096M -Xms4096M -jar minecraft_server.jar How do I get java process's PID while being able to enter input into the Java process? if I change the exec line to exec java -Xmx4096M -Xms4096M -jar minecraft_server.jar & echo $! > pid it won't let me input any text into the Minecraft server java process.

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  • Diff 2 files while ignoring parts of lines

    - by Millianz
    I would like to diff a file system. Currently my bash script prints out the file system recursively into a file (ls -l -R) and diffs it with an expected output. An example for a line in this file would be: drw---- 100000f3 00000400 0 ./foo/ My current diff command is diff "$TEMP_LOG" "$DIFF_FILE_OUT" --strip-trailing-cr --changed-group-format='%' --unchanged-group-format='' "$SubLog" As you can see I ignore additional lines in the current output file, I only care about lines that match with the master output. I now have the problem though that some files may differ in size, or a folder might even have a different name, but due to it's location I know what access rights it should have. For example: Output: ------- 00000000 00000000 528 ./foo/bar.txt Master: ------- 00000000 00000000 200 ./foo/bar.txt Only the size differs here, and it doesn't matter, I would like to just ignore certain parts of the diff, kind of like an ansi c comment. Master: ------- 00000000 00000000 /*200*/ ./foo/bar.txt -- OR -- Master: d------ 00000000 00000000 /*10*/ ./foo//*123123*///*76456546*//bar.txt Output: d------ 00000000 00000000 0 ./foo/asd/sdf/bar.txt And still have it diff correctly. Is this even possible with diff, or will I have to write a custom script for it? Since I'm fairly new to cygwin I might be using the completely wrong tool all together, I'm happy for any suggestions. Update: Taking a step back, here is the general task at hand that I want to achieve. I want to write a script that checks the file system to see if the read/write permissions are set up correctly. The structure of the file system is under my control, so I don't have to worry about it changing too much. Sometimes folders/files might not be present, but if they are their permissions must be checked. For Example assume that the following is a snapshot of the current file system structure drw ./foo drw ./foo/bar -rw ./foow/bar/bar.txt drw ./foo/baz -rw ./foo/baz/baz.txt And this is what the file system structure might dictate, i.e. if these folders / files are present, the permissions must match. drw ./foo drw ./foo/bar -rw ./foo/bar/bar.txt --- ./foo/bar/foobar.txt drw ./foo/baz -rw ./foo/baz/foobaz.txt In this case the file system checked out ok, since all files present match their expected values. The situation becomes more complicated as soon as certain folders might have any arbitrary name, only due to their location I know what their permissions should be. Assume that the directory ./foo/bar in the above example might be such a case, i.e. instead of bar the folder could have any name, but still match the -rw permissions. This seems like a very complicated situation, and I'm not even sure if I can solve it with bash scripting alone. I might have to write an actual application.

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  • How can I detect if a NIC is UP in UNIX?

    - by Rich
    I am currently writing a bash script (for Nagios), and I would like to be able to detect if specific network cards are up or not. My best guess is to do something like this: ifconfig eth0 | grep UP | wc -l or: ethtool eth0 | grep "Link detected: yes" | wc -l Are either/both of those reliable ways of testing if the network card is up, or is there a better option? Perhaps there is a flag on ethtool which will do precisely what I want? Thanks in advance for any suggestions/pointers! Rich

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  • Updated script for downloading from youtube

    - by asksuperuser
    I'm not looking for a software or site to download youtube but for an opensource script in bash or any which is up todate as youtube often changes the download url. I've found this but seems deprecated: http://linux.byexamples.com/archives/302/how-to-wget-flv-from-youtube/ http://www.daniweb.com/forums/thread104419.html

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  • Change directory upwards to specified goal

    - by haakon
    I'm often deep inside a directory tree, moving upwards and downwards to perform various tasks. Is there anything more efficient than going 'cd ../../../..'? I was thinking something along the lines of this: If I'm in /foo/bar/baz/qux/quux/corge/grault and want to go to /foo/bar/baz, I want to do something like 'cdto baz'. I can write some bash script for this, but I'd first like to know if it already exists in some form.

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  • Tail and wildcard characters

    - by Mitch
    I want to get the last 10 lines of multiple files. I know they all end with "-access_log". So I tried: tail -10 *-access_log But this gives me an error, where as: tail -10 file-* Gives me the output I'd expect. I would think this probably has more to do with BASH then tail. However commands like: cat *-access_log Work fine. Any suggestions?

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  • I added __git_ps1 to my PS1 in .bash_profile, now I'm getting (master) for all folders that aren't git repos.

    - by Matthew
    I'm on a Mac (10.6.5). Here's an example of what's going wrong: [m@m ~ (master)]$ cd ~/Documents [m@m ~/Documents (master)]$ cd ~/Applications [m@m ~/Applications (master)]$ cd ~/Library [m@m ~/Library (master)]$ cd ~/Sites/somesite [m@m ~/Sites/somerepo (FEATURE_SOMEFEATURE)]$ Here's the relevant contents of my .bash_profile: source ~/.git-completion.bash PS1='[\u@\h \w$(__git_ps1 " (%s)")]\$ ' I'm using the standard git-completion script - I just copied it to my home directory.

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  • Rsync with a list of variables

    - by EMKA
    I am trying to write a bash script that will rsync only a specific subset of folders. I am trying to figure out a more slick so that I can just add a variables such as FOLDER1='name of folder in home directory' and then rsync -arvz --delete /home/emka/$FOLDER1/ /home/emka/Desktop/Mount/$FOLDER1 Currently I have FOLDER1 through FOLDER13, but I do not want to have the above line thirteen times. Could someone give me a push on how to do this?

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  • Setting alias for DynDNS domain

    - by metalball
    Hey all, I've created DynDNS domain for testing my local sites, and i'm having trouble with pointing to root domain. From my registrar (GoDaddy) I've created a CNAME for www to point my example.dyndns.com so going to url www.example.com I'm reaching my site. But if I'm going to example.com I'm reaching to the IP of the A record. I can't set the IP for the A record to be my IP because I have dynamic IP, and it changes constatly, and I can't point the A record to domain, only IP. When trying to create CNAME record @ to point example.dyndns.com I'm getting error "A record of a different type exists for the hostname @, could not create CNAME" The only record using the '@' host are NS record, which I can't delete, and when tried to set another NS record with @ point to example.dyndns.com, I've lost connection to my site :) So what can I do to get example.com url reach my site? Thanx!

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  • -bash: ls: command not found at Terminal on MAC OS

    - by art.mania
    I need to start using GIT for my projects from now on and I need to use some UNIX commands. but no matter what I do, I always receive "command not found" error. I installed MacPorts, but still cant run any UNIX command :/ When I try ls, I get the error below, same for sudo, or any other command: -bash: ls: command not found and when I try $PATH, I get the lines below: hakan-yilmaz-MacBook-Pro:~ hakanyilmaz$ **$PATH** -bash: /opt/local/bin:/opt/local/sbin:/opt/local/bin:/opt/local/sbin:/opt/local/bin:/opt/local/sbin:/Library/Frameworks/Python.framework/Versions/2.6/bin:/Library/Frameworks/Python.framework/Versions/Current/bin:/opt/subversion/bin/:PATH: No such file or directory I'm on Mac OS X 10.6.6 I spent 2-3 days and kept googling and trying everything I found at forums, but no success. SOLUTION: I opened .bash_profile with TextWrangler and removed everything else than export PATH=/opt/local/bin:/opt/local/sbin:$PATH Then, I reboot that Mac, and WORKING!!!!

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  • Apache2 Doesn't Serve Subdomain Alias

    - by Cyle Hunter
    I'm trying to prefix an existing Rails application with a sub-domain, essentially I want the sub-domain to serve the same application. Right now apache2 serves my application with "www.example.com" or "example.com". I adjusted my sites-available virtualhost in hopes of allowing for "foo.example.com" or "www.foo.example.com" however both instances are met with a domain not found error. Here is my current VirtualHost in /etc/apache2/sites-available/example.com: <VirtualHost *:80> ServerName example.com ServerAlias foo.example.com *.example.com www.foo.example.com www.example.com DocumentRoot /home/user/my_app/public <Directory /home/user/my_app/public> AllowOverride all Options -MultiViews </Directory> </VirtualHost> Any ideas? Note, I realized I probably don't need a wild card sub-domain for what I'm trying to do, I simply added that in as a last-ditch effort. Edit: The actual domain is virtualrobotgames.com with the desired subdomain being roboteer.virtualrobotgames.com

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