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Date: Thu, 11 Oct 2001 08:57:28 -0500
From: JT Williams <jeffw AT darwin DOT sfbr DOT org>
To: djgpp AT delorie DOT com
Subject: duplicating stdin in shell script
Message-ID: <20011011085728.A15517@kendall.sfbr.org>
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Reply-To: djgpp AT delorie DOT com

Is it possible/practical to duplicate stdin (without using tmp files)
so that it can be scanned twice in a shell script?  If so, could someone
please show me a shell idiom to do this?

For example, suppose I want to scan a tab-delimited text file to determine
the maximum width of each field, so I can then pass stdin to `expand'
using appropriate options.

TIA/jtw