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Bash Parameter Expansion
October 04, 2008 (9:00:00 AM) - 1 month, 4 weeks ago
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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 $a or a=$b. 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.
Read more at: linuxjournal.com
