Bash

Bash is the shell, or command language interpreter, that will appear in the GNU operating system.Bash is an sh-compatible shell that incorporates useful features from the Korn shell (ksh) and C shell (csh).

http://www.gnu.org/software/bash/

BASH Programming

BASH Programming - Introduction HOW-TO - http://ldp.huihoo.org/HOWTO/Bash-Prog-Intro-HOWTO.html

tar -cZf /var/my-backup.tgz /home/me/
ls -l > ls-l.txt
STR="Hello World!"
echo $STR  

touch test.sh 
#!/bin/bash
for i in $(ls); do
   echo item: $i
done
for i in `seq 1 10`;
do
   echo $i
done    
$ bash test.sh