Red Hat® Linux® 7 Unleashed

Creating and Executing a Shell Program

Say you want to set up a number of aliases whenever you log on. Instead of typing all of the aliases every time you log on, you can put them in a file by using a text editor, such as vi, and then execute the file.

Here is what is contained in myenv, a sample file created for this purpose (for bash):

#!/bin/sh
alias ll='ls -l'
alias dir='ls'
alias copy='cp'

myenv can be executed in a variety of ways under Linux.

You can make myenv executable by using the chmod command, as follows, and then execute it as you would any other native Linux command:

						# chmod +x myenv
					

This turns on the executable permission of myenv. You need to ensure one more thing before you can execute myenv—it must be in the search path. ...