From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <96fa1b48edef3f254b346628ac2174d8@collyer.net>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] netpbm
Date: Fri,  4 Feb 2005 17:35:24 -0800
From: geoff@collyer.net
In-Reply-To: <003301c50b01$d91b3940$26ec7d50@kilgore>
MIME-Version: 1.0
Content-Type: text/plain; charset="US-ASCII"
Content-Transfer-Encoding: 7bit
Topicbox-Message-UUID: 3fce679a-eace-11e9-9e20-41e7f4b1d025

Russ requested recognising compressed archives by name (e.g., *.tgz)
when extracting, and creating compressed archives under `rz'
key-letters, with the compressor determined by the archive name.  It
doesn't use a different key-letter (option) for each compression
scheme.  It's table-driven and just runs the appropriate compressor or
decompressor.  We've all got shell scripts to do this sort of thing,
but dealing with compressed archives is a common case and I don't see
much harm in having tar initiate one end of a pipeline internally
rather than requiring the user to do it externally.

My tar.c is 994 lines currently, a little bigger than
/sys/src/cmd/tar.c at 795 lines.  It looks like 102 lines are devoted
to dealing with compressed archives.