Ubuntu Unleashed 2014 Edition: Covering 13.10 and 14.04,Ninth Edition

Writing and Executing a Shell Script

Why should you write and use shell scripts? Shell scripts can save you time and typing, especially if you routinely use the same command lines multiple times every day. Although you could also use the history function (press the Up or Down keys while using bash or use the history command), a shell script can add flexibility with command-line argument substitution and built-in help.

Although a shell script doesn’t execute faster than a program written in a computer language such as C, a shell program can be smaller in size than a compiled program. The shell program does not require any additional library support other than the shell or, if used, existing commands installed on your system. The process of creating ...