Unix variable question

From: Sinardy Xing <SinardyXing_at_bkgcomsvc.com>
Date: Tue, 25 Feb 2003 01:28:42 -0800
Message-ID: <F001.00558124.20030225012842@fatcity.com>

Hi all,

Can someone help me understand this...

ROOT # TEST=${2:-.}
ROOT # echo $TEST
ROOT #.

what is 2:-.

another similar code

ROOT # TEST=${1:-0}
ROOT # echo $TEST
ROOT # 0

they looks like emoticon for me

Thank you

Sinardy
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Author: Sinardy Xing
  INET: SinardyXing_at_bkgcomsvc.com

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