Friday, October 3, 2008

Bash Parameter Expansion

If you use bash you already know what Parameter Expansion is,
although you may have used it without knowing its name.
Anytime you use a dollar sign followed by a variable name you're
doing what bash calls Parameter expansion, eg echo $a or
But parameter expansion has numerous other forms which allow you to
expand a parameter and modify the value or substitute other values
in the expansion process.

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