Bash Programming Cheat Sheet

admin — Tue, 30 Dec 2008 20:28:41 +0000

A quick overview of Bash shell syntax: JustLinux’s Bash Programming Cheat Sheet.

Loop Over Each Line in a File using Bash

admin — Sun, 28 Dec 2008 23:40:52 +0000

Use exec as below, for example:

exec < $PASSWORD_FILE
while read LINE; do
  user=`echo $LINE | cut -d: -f1`
  uid=`echo $LINE | cut -d: -f3`
  pgroup=`echo $LINE | cut -d: -f4`
  homedir=`echo $LINE | cut -d: -f6`
  shell=`echo $LINE | cut -d: -f7`
  gecos=`echo $LINE | cut -d: -f5`
  cmd="/usr/sbin/useradd -u $uid -g $pgroup -d $homedir -s $shell -c $gecos $user"
done

You may need to store stdin within another file descriptor if you need your script to receive input from stdin after the loop runs.

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Bash Programming Cheat Sheet

Loop Over Each Line in a File using Bash