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From: del@thrush.mlb.semi.harris.com (Don Lewis)
Newsgroups: comp.unix.questions
Subject: Re: edit first line of long file
Message-ID: <1990Oct24.200800.8776@mlb.semi.harris.com>
Date: 24 Oct 90 20:08:00 GMT
References: <4597:Oct2321:44:2190@kramden.acf.nyu.edu> <10201:Oct2404:23:3890@kramden.acf.nyu.edu> <27144@mimsy.umd.edu>
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In article <27144@mimsy.umd.edu> chris@mimsy.umd.edu (Chris Torek) writes:
>On many machines, head uses standard I/O, and stdio reads in a block
>and head prints out the first line.  Then head exits, leaving the file
>seek pointer pointing at the second block.  Cat then reads and prints
>blocks two through the end.

And then there is SunOS.  In 4.0.x, `(head -1; cat) <file' prints the
first line twice because the mmap that cat does on its input file doesn't
take the file offset into account.  In 4.1, they fixed this bug and we
now get the same broken behavior as most other machines.
-- 
Don "Truck" Lewis                      Harris Semiconductor
Internet:  del@mlb.semi.harris.com     PO Box 883   MS 62A-028
Phone:     (407) 729-5205              Melbourne, FL  32901