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Re: redirection after braced block

From: Matthew Woehlke
Subject: Re: redirection after braced block
Date: Mon, 05 Oct 2009 14:03:06 -0500
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20090825 Fedora/ Thunderbird/ Mnenhy/

clemens fischer wrote:
Andreas Schwab wrote:

clemens fischer writes:

I have the following construct in a script:

  ... a number of commands
      ... a number of commands
  } 2>&1 | ${prog_log} "${logfile}"

It seems anything inside the braces is not seen by bash, and it
doesn't show up in a "sh -x ..." trace, but ${prog_log} does.  I had
debug echo's at the start of the block, they aren't triggered.
The trace goes to stderr, but you've just redirected it.

yeah ok, but the commands really are not executed.  I have an option
dry-run in the script, which sets "prog_log=true".  Then there are
a bunch of verbose commands in the block, none of get touched.

This sort of construct seems to be working fine for me. Note that the contents of the block are executed in a subshell, and using 'true' as prog_log will suppress both stdout and stderr, as set up (though you might get a broken pipe error). So unless the commands in the block have side effects observable outside of the script, you won't know whether or not they execute.

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