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How to match pattern in bash?

From: Peng Yu
Subject: How to match pattern in bash?
Date: Tue, 22 Feb 2011 21:24:29 -0600

Suppose that I have a variable $x, I want to test if the content of $x
match the pattern 'abc*'. If yes, then do something. (The operator ==
doesn't match patterns, if I understand it correctly.)

Is there such a build-in feature in bash? Or I have to rely on some
external program such as perl to test the pattern matching?


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