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[Help-bash] How to understand the end part

From: lina
Subject: [Help-bash] How to understand the end part
Date: Mon, 02 Jan 2012 22:32:18 +0800
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20111114 Icedove/3.1.16


$ stringZ=abc123; echo `expr "$stringZ" : '.*' `

I don't know how to understand the : '.*' part,

Thanks for any explaination,

Best regards,

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