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• How can I rename files from a list in bash?

  - by GeoffreyF67

  I have a file that contains filenames like this: my_cool_file.xxx my_cool_file2.xxx my_cool_file3.xxx I have a folder that has: some_file.xxx some_file2.xxx some_file3.xxx I would like to have a bash script to take one line from the filename file and rename one file in the folder. Is there a way to do this?

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• How to pass parameters to a Linux Bash script?

  - by chun

  I have a Linux bash script 'myshell'. I want it to read two dates as parameters, for example: myshell date1 date2. I am a Java programmer, but don't know how to write a script to get this done. The rest of the script is like this: sed "s/$date1/$date2/g" wlacd_stat.xml >tmp.xml mv tmp.xml wlacd_stat.xml

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• Grab a random number of bytes from a file with bash?

  - by GeoffreyF67

  I have a file of 256MB. I'd like to retrieve a random amount of data from this file and copy it to another file. Is there a way to do this in bash or some other way? G-Man Edit: choose a random number between 1 and 256 then copy that number of mb from one file to another.

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• How to search an expression in a file from a bash script?

  - by Neuquino

  I have a bash script. I need to look if "text" exists in the file and do something if it exists. Thanks in advance

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• How to get the first line of a file in a bash script?

  - by Neuquino

  I have to put in a bash variable the first line of a file. I guess it is with the grep command, but it is any way to restrict the number of lines? Thanks in advance

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• How to pass an associative array as argument to a function in Bash?

  - by niksfirefly

  How do you pass an associative array as an argument to a function? Is this possible in Bash? The code below is not working as expected: function iterateArray { local ADATA="${@}" # associative array for key in "${!ADATA[@]}" do echo "key - ${key}" echo "value: ${ADATA[$key]}" done } Passing associative arrays to a function like normal arrays does not work: iterateArray "$A_DATA" or iterateArray "$A_DATA[@]"

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• Why is the value if this string executing in a bash script?

  - by Ross

  Hello Why is this script executing the string in the if statement: #!/bin/bash FILES="*" STRING='' for f in $FILES do if ["$STRING" = ""] then echo first STRING='hello' else STRING="$STRING hello" fi done echo $STRING when run it with sh script.sh outputs: first lesscd.sh: line 7: [hello: command not found lesscd.sh: line 7: [hello hello: command not found lesscd.sh: line 7: [hello hello hello: command not found lesscd.sh: line 7: [hello hello hello hello: command not found lesscd.sh: line 7: [hello hello hello hello hello: command not found hello hello hello hello hello hello p.s. first attempt at a shell script thanks

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• AWK: how to read columnwise file to AWK-script in Bash?

  - by HH

  $ cat read.sh #!bin/bash // how can I read the columnwise data to awk-script? awk '{sum+=$1} END {print sum}' read $ cat data 1 2 3 4 5 $ . ./read.sh <data awk: cmd. line:1: fatal: cannot open file `read' for reading (No such file or directory)

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• Automatically timing every executed command and show in Bash prompt?

  - by mfn

  I often happen to forget to explicitly prefix executions with the "time" command, ideally I would see in the next shell prompt how much real time the last command took (on every command). I already scoured through the bash documentation, but couldn't find anything related.

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• Bash: how to process variables from an input file?

  - by gilgongo

  I've got a bash script that reads input from a file like this: while IFS="|" read -r a b do echo "$a something $b somethingelse" done < "$FILE" The file it reads looketh like this: http://someurl1.com|label1 http://someurl2.com|label2 However, I'd like to be able to insert the names of variables into that file when it suits me, and have the script process them when it sees them, so the file might look like this: http://someurl1.com?$VAR|label1 http://someurl2.com|label2 So $VAR could be, for example, today's date, producing an output like this: http://someurl1.com something label1 somethingelse http://someurl2.com?20100320 something label2 somethingelse

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• Loading variables from a text file into bash script.

  - 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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• In the bash script how do I know the script file name?

  - by Ma99uS

  How can I determine the name of the bash script file inside the script itself? Like if my script is in file runme.sh, than how would I make it to display "You are running runme.sh" message without hardcodding that? Thanks,

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• How to store and echo multiple lines elegantly in bash?

  - by EmpireJones

  I'm trying to capture a block of text into a variable, with newlines maintained, then echo it. However, the newlines don't seemed to be maintained when I am either capturing the text or displaying it. Any ideas regarding how I can accomplish this? Example: #!/bin/bash read -d '' my_var <<"BLOCK" this is a test BLOCK echo $my_var Output: this is a test Desired output: this is a test

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• How do I pass a Python Variable to Bash?

  - by user336537

  Hello, How would I pass a Python variable to the Bash shell? It should work like this: foo="./RetVar.py 42" Replace the double-quotes with `s I have tried printing and sys.exiting the result, but to no avail. How would I accomplish my goal?

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• In Bash, how do you access command line arguments inside a function?

  - by DonGar

  I'm attempting to write a function in bash that will access the scripts command line arguments, but they are replaced with the positional arguments to the function. Is there any way for the function to access the command line arguments if they aren't passed in explicitly? # Demo function function stuff { echo $0 $* } # Echo's the name of the script, but no command line arguments stuff # Echo's everything I want, but trying to avoid stuff $*

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• How do I write a bash script to restart a process if it dies?

  - by Tom

  I have a python script that'll be checking a queue and performing an action on each item: # checkqueue.py while True: check_queue() do_something() How do I write a bash script that will check if it's running, and if not, start it. Roughly the following pseudo code (or maybe it should do something like ps | grep?): # keepalivescript.sh if processidfile exists: if processid is running: exit, all ok run checkqueue.py write processid to processidfile I'll call that from a crontab: # crontab */5 * * * * /path/to/keepalivescript.sh Thanks in advance.

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• What is your single most favorite command-line trick using Bash?

  - by hoyhoy

  We all know how to use <ctrl>-R to reverse search through history, but did you know you can use <ctrl>-S to forward search if you set stty stop ""? Also, have you ever tried running bind -p to see all of your keyboard shortcuts listed? There are over 455 on Mac OS X by default. What is your single most favorite obscure trick, keyboard shortcut or shopt configuration using bash?

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• How to get the line non-empty of a file using tail ? Bash

  - by debugger

  Do you have an idea how to get the last line non-empty using tail in bash ? For example my_file.txt will be as following: hello hola bonjour (empty line) (empty line) Obviously if i do tail -n 1 my_file.txt i will get an empty line. In my case i want to get bonjour Any clues? Thanks Debugger

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• Is there a good free (prefrerably PDF) bash tutorial online?

  - by morpheous

  I am finding myself doing a lot more messing around with scripts than I used to and my lack of knowledge in this area (and linux sysadmin/security in general), is becoming a hindrance. Can anyone recommend a good online resource for bash scripting/linux admin. Preferably, it will be in pdf format, so I can copy it (single file) onto my PDA.

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• How do I get the last non-empty line of a file using tail in Bash?

  - by debugger

  How do I get the last non-empty line using tail under Bash shell? For example, my_file.txt looks like this: hello hola bonjour (empty line) (empty line) Obviously, if I do tail -n 1 my_file.txt I will get an empty line. In my case I want to get bonjour. How do I do that?

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• How to suppress Terminated message after killing in bash?

  - by emergence

  How can you suppress the 'Terminated' message that comes up after you kill a process in a bash script? I tried set +bm, but that doesn't work. I know another solution involves calling 'exec 2 /dev/null', but is that reliable? How do I reset it back so that I can continue to see stderr? Thanks

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• How do I use a file grep comparison inside a bash if/else statement?

  - by openid_kenja

  When our server comes up we need to check a file to see how the server is configured. We want to search for the following string inside our /etc/aws/hosts.conf file: MYSQL_ROLE=master Then, we want to test whether that string exists and use an if/else statement to run one of two options depending on whether the string exists or not. What is the BASH syntax for the if statement? if [ ????? ]; then #do one thing else #do another thing fi

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• How to print value of a variable (which can be "-n" or "-e") in bash?

  - by Vi

  How to print "-n", "-e" or "-neeenen" from bash (without a newline at the end, without invoking of external programs)? Q="-n" echo -n "$Q" # fail echo -- "$Q" # fail cat <<< "$Q" # fail, also starts external program printf -- '%s' "$Q" # success, but starts external program

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• How can I roll back 1 commit?

  - by n179911

  I have 2 commits that I did not push: $ git status # On branch master # Your branch is ahead of 'faves/master' by 2 commits. How can I roll back my first one (the oldest one), but keep the second one? $ git log commit 3368e1c5b8a47135a34169c885e8dd5ba01af5bb ... commit baf8d5e7da9e41fcd37d63ae9483ee0b10bfac8e ... From here: http://friendfeed.com/harijay/742631ff/git-question-how-do-i-rollback-commit-just-want Do I just need to do: git reset --hard baf8d5e7da9e41fcd37d63ae9483ee0b10bfac8e That is?

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• How does everyone set up AWS for PHP with a git workflow while worrying about distributing EC2?

  - by Parris

  Hello, I have been looking for something like heroku but for php, and after much frustration (and almost finding what I need, but not quite) we decided to just go with AWS without any other abstraction. We are using PHP 5.3 (and CakePHP 1.3), and are currently using git. Ubuntu seems like the easiest way to get both of those on there and we will most likely use that. We aren't really going worry about outgoing email. We are using smtp through gmail, but will most likely switch to some other service eventually. I had 3 questions: 1) I have been looking at Zend Server, and I am not quite sure how that is more beneficial than xampp. Perhaps it is not? 2) I suppose to make the application scale we would need multiple instances of some ec2 ami. Then just duplicate it and such. The question then becomes how do we make sure all EC2 instances are up to date? 3) I understand the concept of load balancing to some degree. I understand that in 1 region you select a bunch of servers and have it load balance across them. The question then becomes well how about world wide? How do I make it so that traffic is directed to the correct ec2 server? I have heard of route 53, and tried signing up for that, but nothing appears in my control panel. Also perhaps it is just a DNS thing with my domain registrar? AHHH... some tutorial would be helpful!

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