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Re: read doesn't work with piped stdin

From: Pierre Gaston
Subject: Re: read doesn't work with piped stdin
Date: Mon, 19 Nov 2007 10:10:03 +0200

> Description:
>         read silently fails when stdin is piped to it.  -u switch does not 
> help.
>     Redirection works fine.

This and your other bug result from the fact that the commands in the
pipe run in  subshells.

echo foo | read # doesn't work because a subshell cannot modify the
parent process
echo foo | exit # only exits the subshell

exit < file # works because the redirection doesn't create a subshell
read var <<< foo # again no subshell here

It's the same thing as if you try: (read foo) or  (exit foo)

see also:

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