BASH Scripting

Shebang

#!

Comment

#

hello_world.sh

#!/bin/bash

# declare STRING variable

STRING="Hello World"

#print variable on a screen

echo $STRING

Make Script executable

$ chmod +x hello_world.sh

Execute

./hello_world.sh

backup.sh

#!/bin/bash

LO=myhome_directory_$(date +%Y%m%d).tar.gz

tar -czf $LO /home/important

Execute shell commands with BASH with back-tics

without back-ticks, just echoing happens. Use back-tics to pass commands that you'll type in the terminal

echo `uname -o`

Reading User Input

echo -e "Type the word"

read  word

echo "The word you entered is: $word"

use \"hello\" if you want to print "hello". \" is escape for ".

read

using just read reads input to the default variable $REPLY

read -a myarray

using -a reads input to a myarray variable. Retrieve stored values using

${myarray[0]}, ${myarray[1]}, etc.

Bibiliography

[1] "Bash Scripting Tutorial", <http://www.linuxconfig.org/Bash_scripting_Tutorial>, retrieved May 11, 2011.