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• send key code to command line program os x bash script

  - by Sandy Vanderbleek

  I want to make a script that starts a program and then sends it key input. #!/bin/bash ./program (PRESS CONTROL-Z) Is this possible? From what I've found I thought it might require key codes but I could be wrong.

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• In a bash script echo shell commands

  - by user343547

  In a bash script how do I echo all shell commands called and expand any variable names? For example, given the following line: ls $DIRNAME I would like the script to run the command and display the following ls /full/path/to/some/dir The purpose is to save a log of all shell commands called and their arguments. Perhaps there is a better way of generating such a a log?

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• Bash: trim a parameter from both ends

  - by Andrey Kazak

  Greetings! This are well know Bash parameter expansion patterns: ${parameter#word}, ${parameter##word} and ${parameter%word}, ${parameter%%word} I need to chop one part from the beginning and anoter part from the trailing of the parameter. Could you advice something for me please?

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• Escape characters contained by bash variable in regex pattern

  - by Skuja

  In my bash script, i am trying to execute following Linux command: sed -i "/$data_line/ d" $data_dir $data_line is entered by user and it may conatain special characters that could brake regex. How can i escape all of the possible special characters in $data_line before i execute sed command?

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• Read characters from a text file using bash

  - by Simon Hodgson

  Does anyone know how I can read the first two characters from a file, using a bash script. The file in question is actually an I/O driver, it has no new line characters in it, and is in effect infinitely long.

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• Bash edit file and keep last 500 lines

  - by Lizard

  I am looking to create a cron job that opens a directory loops through all the logs i have created and deletes all lines but keep the last 500 for example. I was thinking of something along the lines of tail -n 500 filename > filename Would this work? I also not sure how to loop through a directory in bash Thanks in advance.

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• get bash history to vi

  - by nameanyone

  When I try to read bash history into vim, I get nothing. :r !history If I just execute the command, i.e. :!history instead of history I get a snapshot of my terminal as it looked before I started vim. How can I read the output of "history" into vim? Reading the contents of .bash_history won't do as I save history with timestamps: HISTTIMEFORMAT='%Y.%m.%d %R '

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• Bash or Bourne Scripts?

  - by sixtyfootersdude

  Is it better practice to write Bash scripts or Bourne scripts? My team writes Bourne scripts but I am not entirely sure why. If this is a holy war question (ie: vim vs. emacs) please just reply: holy war.

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• Inline comments for bash?

  - by Lajos Nagy

  I'd like to be able to comment out a single flag in a one-line command. Bash only seems to have `from # till end-of-line' comments. I'm looking at tricks like: ls -l $([ ] && -F is turned off) -a /etc It's ugly, but better than nothing. Anybody has any better suggestions?

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• running a bash script from a make file

  - by Matthew

  I have a makefile from which I want to call another external bash script to do another part of the building. How would I best go about doing this.

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• Bash script, read values from stdin pipe

  - by gmatt

  I'm trying to get bash to process data from stdin that gets piped it, but no luck, what I mean is none of the following work: echo "hello world" | test=($(< /dev/stdin)); echo test=$test test= echo "hello world" | read test; echo test=$test test= echo "hello world" | test=`cat`; echo test=$test test= where I want the output to be test=hello world. Note I've tried putting "" quotes around "$test" that doesn't work either.

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• bash completion for Subversion

  - by khmarbaise

  I've tried to load bash_completion in my bash (3.2.25), it does not work. No message etc. I've used the following in my .bashrc if [ -f ~/.bash_completion ]; then . ~/.bash_completion fi I also tried to use .bash_profile instead, but with the same result. So the problem is why does it not work? Any idea? Hints?

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• Batch equivilant of Bash backticks

  - by MiffTheFox

  When working with Bash, I can put the output of one command into another command like so: my_command `echo Test` would be the same thing as my_command Test (Obviously, this is just a non-practical example.) I'm just wondering if you can do the same thing in Batch.

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• Recursive follow files in bash

  - by user328955

  I have files which contain file names pointing to other files. These files contain further file names pointing further files and so on. I need a bash script which follows each files recursively and logs into file every touched file during the run. file1: file2 file3 file2: file4 file3: file5 file4 and file5 are empty. Result: file1 file2 file4 file3 file5

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• bash: assign grep regex results to array

  - by Ryan

  Hello everyone, I am trying to assign a regular expression result to an array inside of a bash script but I am unsure whether that's possible, or if I'm doing it entirely wrong. The below is what I want to happen, however I know my syntax is incorrect: indexes[4]=$(echo b5f1e7bfc2439c621353d1ce0629fb8b | grep -o '[a-f0-9]\{8\}') such that: index[1]=b5f1e7bf index[2]=c2439c62 index[3]=1353d1ce index[4]=0629fb8b Any links, or advice, would be wonderful :)

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• BASH Arithmetic Expressions

  - by Arko

  I had used several ways to do some simple integer arithmetic in BASH (3.2). But I can't figure out the best (preferred) way to do it. result=`expr 1 + 2` result=$(( 1 + 2 )) let "result = 1 + 2" What are the fundamental differences between those expressions? Is there other ways to do the same? Is the use of a tool like bc mandatory for floating point arithmetic? result=`echo "7/354" | bc`

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• Loading variables from a text bash.

  - by S1syphus

  Is it possible to load new lines from a text file to variables in bash? Text file looks like? EXAMPLEfoo EXAMPLEbar EXAMPLE1 EXAMPLE2 EXAMPLE3 EXAMPLE4 Variables become $1 = EXAMPLEfoo $2 = EXAMPLEbar ans so on?

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• Get list of Python module variables in Bash

  - by l0b0

  For a Bash completion script I need to get all the variables from an installed Python module that match a pattern. I want to use only Python-aware functionality, to avoid having to parse comments and such.

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• New Application Process from Bash Shell

  - by Thomas Uster

  I'm relearning UNIX commands to use git on windows using MINGW32. When I launch a program, for example "$ notepad hello.txt" I can't use the shell again until I close the notepad file or CTRL-C in the shell. How do I essentially fork a new process so I can use both programs?

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• How to build a conditional assignment in bash?

  - by Neuquino

  I'm looking a way to build conditional assignments in bash: In Java it looks like this: int variable= (condition) ? 1 : 0; Thanks in advance

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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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• Extract File Basename Without Path and Extension in Bash

  - by neversaint

  Given file names like these: /the/path/foo.txt bar.txt I hope to get foo bar Why this doesn't work? #!/bin/bash fullfile=$1 fname=$(basename $fullfile) fbname=${filename%.*} echo $fbname What's the right way to do it?

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• [bash] Escape a string for sed search pattern

  - by Alexander Gladysh

  In my bash script I have an external (received from user) string, which I should use in sed pattern. REPLACE="<funny characters here>" sed "s/KEYWORD/$REPLACE/g" How can I escape the $REPLACE string so it would be safely accepted by sed as a literal replacement? NOTE: The KEYWORD is a dumb substring with no matches etc. It is not supplied by user.

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• Bash: ambiguous redirect

  - by Werner

  Hi, I get in a bash script, in the follwoing line echo $AAAA" "$DDDD" "$MOL_TAG >> ${OUPUT_RESULTS} the error: line 46: ${OUPUT_RESULTS}: ambiguous redirect Why? Thanks

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• Variable assignment in bash

  - by Werner

  Hi, this is probably a very stupid question; in a bash script, given the output of, for instance; awk '{print $7}' temp it gives 0.54546 I would like to give this to a variable, so I tried: read ENE <<< $(awk '{print $7}' temp) but I get Syntax error: redirection unexpected Could you tell me why, and what is the easiest way to do this assignment? Thanks

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