Variables Summary


        
            
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            Variables Summary
$1, $2, ...

The first, second, etc command-line arguments to the script.

variable=value

To set a value for a variable. Remember, no spaces on either side of =

Quotes " '

Double will do variable substitution, single will not.

variable=$( command )

Save the output of a command into a variable

export var1

Make the variable var1 available to child processes.

Important Concepts!
Formatting

The presence or absence of spaces is important.

Manageability

If a particular value is used several times within a script (eg a file or directory name) then using a variable can make it easier to manage.