Bash

From Cheatsheet

Bash is cool, you can do stuff with it

Notes

• Tutorial start here: http://www.tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html
• Good basic tutorial: http://tiswww.case.edu/php/chet/bash/bashref.html
• Good FAQ here: http://wooledge.org/mywiki/BashFAQ

#!/bin/bash	the first line always
A=`grep whatever somefile` echo $A	runs a command, assigns it to the variable "A", then prints that variable. Note: you need the backward single quote around the command
tee output_file.txt	word counts my_text_file.txt and then outputs the results to output_file.txt

sed -n '/^\s*#/{N;s/^#.*\n//p}' somefile	super cool stream editor
-n	suppress automatic printing of pattern space

remove spaces in filenames

 for file in *; do mv "$file" `echo $file | sed -e 's/  */_/g' -e 's/_-_/-/g'`; done