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Re: [Help-bash] read
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From: |
Chet Ramey |
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Subject: |
Re: [Help-bash] read |
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Date: |
Sun, 18 Mar 2012 13:08:07 -0400 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2 |
On 3/17/12 11:47 PM, Bill Gradwohl wrote:
> address@hidden ~# TMOUT=1; read; echo $?; sleep 10
> 142
>
>
> Can I count on that return code for a timeout?
>
> What are the other read return codes?
The bash documentation guarantees that the return status will be greater
than 128 if `read' times out. Right now, that's 128+SIGALRM, but that's
not a guarantee (and SIGALRM doesn't have the same value everywhere).
Other errors, listed in the man page, will cause the exit status to be
greater than 0.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU address@hidden http://cnswww.cns.cwru.edu/~chet/