Path: utzoo!attcan!uunet!unsvax!jimi!tahoe!apple!mrspoc!itkin
From: itkin@mrspoc.Transact.COM (Steven M. List)
Newsgroups: comp.unix.questions
Subject: Re: How read a line of a file from C-shell?
Message-ID: <1990Oct25.005645.2969@mrspoc.Transact.COM>
Date: 25 Oct 90 00:56:45 GMT
References: <8913@ncar.ucar.edu>
Reply-To: itkin@guinan.Transact.COM
Organization: Transact Software, Inc., Los Altos, CA
Lines: 29

tparker@bierstadt.scd.ucar.edu (Tom Parker) writes:

>Thanks to all those that replied.
> 
>The most feasible tip (so far) was to read the file using sed, e.g.:
> 
>         set lines = `wc -l $file`
> 
>         while ($i <= $lines[1])
>            set line = `sed -n ${i}p $file`
>            echo $i $#line $line
>            # (Process $line here)
>            @ i++
>         end
> 
>This seems to work well, as long as the file doesn't contain any
>meta-characters.  (I could put the `sed ...` in double quotes, but then I
>can't tokenize the line).

One small optimization:

    set -n "${i}p;${i}q" $file

This will cause sed to STOP when it has printed the line you want.
-- 
 +----------------------------------------------------------------------------+
 :                Steven List @ Transact Software, Inc. :^>~                  :
 :           Chairman, Unify User Group of Northern California                :
 :     {apple,coherent,limbo,mips,pyramid,ubvax}!itkin@guinan.Transact.COM    :