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Re: lost output from asynchronous lists
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From: |
Eric Blake |
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Subject: |
Re: lost output from asynchronous lists |
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Date: |
Wed, 29 Oct 2008 06:26:56 -0600 |
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Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.17) Gecko/20080914 Thunderbird/2.0.0.17 Mnenhy/0.7.5.666 |
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According to Eric Blake on 10/29/2008 6:22 AM:
>>> - ( :; $1 ) >"$at_stdout" 2>"$at_stderr"
>>> + : >"$at_stderr"
>>> + ( :; $1 ) >>"$at_stdout" 2>>"$at_stderr"
>> What's the ":;" for?
>
> A workaround to the bash 3.2 bug, fixed in bash32-030, where failure to
> use :; prior to a compound command (except for a subshell) meant that bash
> incorrectly returns status 0 if redirection fails.
Sorry; I thought it was a different use of :;. In this case, it is a
workaround to the case where the m4 argument $1 is empty or only
whitespace, and is necessary so that the shell code formed is valid (a
subshell must contain a command list).
- --
Don't work too hard, make some time for fun as well!
Eric Blake ebb9@byu.net
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