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Re: bash: variables inside 'while'


From: Paul Jarc
Subject: Re: bash: variables inside 'while'
Date: Thu, 30 Aug 2001 12:11:56 -0400
User-agent: Gnus/5.090004 (Oort Gnus v0.04) Emacs/20.7

This belongs on bash-bug.  Followup-To and Mail-Followup-To set.

address@hidden (Gabriel Zachmann) wrote:
>     cat file |
>     while read p l
>     do
>         xx=$p
>         echo xx=$xx
>         break
>     done
>     echo xx=$xx

This is related to entry E4 in the bash FAQ.  Each element of a
pipeline is run in a separate process, so variable settings are in
effect only within that element.  Try this:
  cat file | { while read p l; do ...; done; echo xx=$xx; }
Or this:
  while read p l; do ...; done < file; echo xx=$xx
(but that will still break on some other sh'es.)


paul



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