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• How to enable tab completion from the terminal specific to the executable

  - by Synesso

  In bash, I believe it is possible to enable tab completion on the terminal for terms that are specific to the executable being invoked. For example, given an executable "eat" with valid arguments {cake, carrot, banana}, typing 'eat car' should complete to 'eat carrot'. I believe this is possible because I have seen it with 'ant' tab-completing its targets (though how this was set up I don't know). How can this behaviour be implemented?

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• extract domain name from url

  - by Ben Smith

  How do I extract the domain name from a url using bash? like: http://example.com/ to example.com must work for any tld, not just .com

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• How to sort output of "s3cmd ls"

  - by dba.in.ua

  Amazon "s3cmd ls" takes like this output: 2010-02-20 21:01 1458414588 s3://file.tgz.00 2010-02-20 21:10 1458414527 s3://file.tgz.01 2010-02-20 22:01 1458414588 s3://file.tgz.00 2010-02-20 23:10 1458414527 s3://file.tgz.01 2010-02-20 23:20 1458414588 s3://file.tgz.02 How to select all files of archive, ending at 0 ... X, with the latest date of fileset ? Bash, regexp ? Thanx!

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• GUI Application on Windows and Linux

  - by Kiran

  Hello, I would like to export the Bash Shell Automation Script Project to a GUI Project which can run in both Windows and Linux. Which Programming Language would be better suited for this ? Any suggestion would be really helpful. Thanks Kiran

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• Temporary operation in a temporary directory in shell script

  - by jhs

  I need a fresh temporary directory to do some work in a shell script. When the work is done (or if I kill the job midway), I want the script to change back to the old working directory and wipe out the temporary one. In Ruby, it might look like this: require 'tmpdir' Dir.mktmpdir 'my_build' do |temp_dir| puts "Temporary workspace is #{temp_dir}" do_some_stuff(temp_dir) end puts "Temporary directory already deleted" What would be the best bang for the buck to do that in a Bash script? I want to trap

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• Regex and Arrays

  - by syker

  What is a regex I can write in bash for parsing a line and extracting text that can be found between two | (so that would be ex: 1: |hey| 2: |boy|) and keeping those words in some sort of array?

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• Show Hexadecimal Numbers Of a File

  - by Nathan Campos

  I want to build a bash program that can read a file, like a *.bin and print all its hexadecimal numbers, as 'hex' editors do. Where I can start?

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• Sorting a string in array, making it sparsely populated.

  - by S1syphus

  For example, say I have string like: duck duck duck duck goose goose goose dog And I want it to be as sparsely populated as possible, say in this case duck goose duck goose dog duck goose duck What sort of algorithm would you recommend? Snippets of code or general pointers would be useful, languages welcome Python, C++ and extra kudos if you have a way to do it in bash.

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• BASH- Run MPlayer if either there are no users on display :0 or if there is more than one argument

  - by rob

  This is the script I currently have- #!/bin/bash if["$#" == "2" OR who | grep ":0" == ""] export DISPLAY=:0 xset dpms force on mplayer -fs $1.mp4 fi It doesn't work. Thanks for your help.

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• Prevent command "del /s" from entering a folder

  - by jzuniga

  I need to recursively remove unnecessary files from a svn repository and i have the following batch file to do this: @echo on del /s ~*.* del /s *.~* del /s Thumbs.db However, this is also deleting the entries under the .svn/ subfolders. Is there any way to prevent this commands from being executed under the .svn/ folders so that it doesn't mess things up? Thanks in advance! EDIT: A solution using Bash (cygwin) would also work for me since i just need to do this once.

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• How to detect if a script is being sourced

  - by brianegge

  I have a script where I do not want it to call 'exit' if it's being sourced. Initially I though checking if $0 == bash but this has problems if the script is sourced from another script, or if the user sources it from ksh. Is there a reliable way of detecting if a script is being sourced?

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• How to get the first numbers with SED linux

  - by iassael

  Hello i have this line... "00:02.0 VGA compatible controller: InnoTek Systemberatung GmbH VirtualBox Graphics Adapter" how can i get the first numbers until VGA with SED in Bash script? Thanks!

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• How do I echo $command without breaking the layout

  - by w00t

  Hi. I'm trying to do the following in a bash script: com=`ssh host "ls -lh" ` echo $com It works, but the echo will break the output (instead of getting all lines in a column, I get them all in a row). If I do: ssh host ls -lh in the CLI it will give me the correct output + layout. Any ideas?

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• can i do multiple things in one command on linux?

  - by Jason94

  Im testing something where im compiling some code and analysing output with a perl script. So first i run make, manually copy&paste the output to errors.txt and then running my perl script (running: perl analysis.pl) in terminal. Is there away I can do this just with one line in bash?

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• Conditional action based on whether any file in a directory has a ctime newer than X

  - by jberryman

  I would like to run a backup job on a directory tree from a bash script if any of the files have been modified in the last 30 minutes. I think I can hack together something using find with the -ctime flag, but I'm sure there is a standard way to examine a directory for changes. I know that I can inspect the ctime of the top level directory to see if files were added, but I need to be able to see changes also. FWIW, I am using duplicity to backup directories to S3.

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• Sending STDERR to logger

  - by Gnutt

  Im writing a bash-script to perform an offsite backup, using rsync over SSH. I'm able to send STDOUT to logger, for logs via rsync --del -az -e 'ssh -i mycrt.crt' /home/gnutt/backup/ me@offisite:backup | logger -i But I want to send STDERR instead, so if there is a problem, such as that offsite is unavailable, that output should be sent to logger and logged.

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• how to stop objcopy from padding sections

  - by Jah

  I'm using objcopy on bash (ubuntu linux) and im trying to copy 2 sections from an ELF file using the folowing commend: objcopy -j .section1 -j .section2 The problem is the objcopy is adding some padding between the sections. Is there a way (a flag?) that can stop objcopy from padding the sections? the sections are placed one after the other in the file so there is no need for any kind of padding....

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• What is the difference between PS1 and PROMPT_COMMAND

  - by Jed Daniels

  While taking a look at this awesome thread I noticed that some examples use PS1="Blah Blah Blah" and some use PROMPT_COMMAND="Blah Blah Blah" (and some use both) when setting the prompt in a bash shell. What is the difference between the two? An SO search and even a bit of broader google searching aren't getting me results, so even a link to the right place to look for the answer would be appreciated. Thanks!

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• How to get the full pathname of the current shell script?

  - by Dan

  Is there a less brute-force way to do this? #!/bin/ksh THIS_SCRIPT=$(/usr/bin/readlink -f $(echo $0 | /bin/sed "s,^[^/],$PWD/&,")) echo $THIS_SCRIPT I'm stuck using ksh but would prefer a solution that works in bash too (which I think this does).

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• Shell loops using non-integers?

  - by mary

  I wrote a .sh file to compile and run a few programs for a homework assignment. I have a "for" loop in the script, but it won't work unless I use only integers: #!/bin/bash for (( i=10; i<=100000; i+=100)) do ./hw3_2_2 $i done The variable $i is an input for the program hw3_2_2, and I have non-integer values I'd like to use. How could I loop through running the code with a list of decimal numbers?

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• Replacing multiple bar (special char) with tab using SED

  - by neversaint

  I have a string like this BRADI5G20430|BRADI5G20430.1||1 How can I replace the bar (single and multiple) with tab ("\t")? I tried this but dont' work sed 's/\|+/\t/g' I also want to include this line in bash script.

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• redirect stdout and stderr to a single file with prefixes

  - by João Portela

  I am writing a bash script and need to redirect the stdout and stderr output of a command i run to a single file, prefixing each line with stderr or stdout, accordingly. is there a simple way to do this?

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• recursively add file extension to all files

  - by seengee

  I have a few directories and sub-directories containing files with no file extension. I want to add .jpg to all the files contained within these directories. I have seen bash scripts for changing the file extension but not for just adding one. It also needs to be recursive, can someone help please?

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• Run a python process in a separate thread

  - by Bialecki

  I'm looking for a quick bash script or program that will allow me to kick off a python script in a separate thread. What's the best way to do this? I know this is incredibly simple, just curious if there's a preferred way to do it.

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• how can i use regex to get a certain string of a file

  - by chun

  Hi with linux bash shell , how can i use regex to get a certain string of a file by example: for filename *.tgz do "get the certain string of filename (in my case, get 2010.04.12 of file 2010.01.12myfile.tgz)" done or should I turn to perl Merci frank

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