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  Oracle Tips by Burleson

User defined variables

Shells also allow you to create your own variables for use within scripts (local variables) and to pass between scripts (global variables). User variables are traditionally created using lower-case characters.

To create a variable merely choose a lower-case name for the variable and give it a value using an equal (=) sign. Make certain that there are no spaces on either side of the equal sign. You can use the unset command to nullify the value of a previous set variable. Here are some examples.

Creating user variables

$ myname='Terry Clark'

$ echo myname


$ echo $myname

Terry Clark

$ unset myname

$ echo $myname

$ number=10

$ echo $number


The variables created above are local variables available only to the current shell. We must export variables if we wish them to become global and can be referenced by other shell scripts.

Creating global user variables

$ myname=Terry

$ export myname


$ export myname=Terry


The above book excerpt is from:

Easy Linux Commands
Working Examples of Linux Command Syntax

ISBN: 0-9759135-0-6   

Terry Clark 

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