85 lines
1.7 KiB
Bash
Executable file
85 lines
1.7 KiB
Bash
Executable file
#!/bin/bash
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: <<=cut
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=pod
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=head1 NAME
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neno - no error no output
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=head1 SYNOPSIS
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B<neno> I<command1> [\; I<command2> ...]
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=head1 DESCRIPTION
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B<neno> will print the output from both standard output and standard
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error if the composed command returns an error. If the composed
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command returns true, the output will be ignored. This is useful for
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cron jobs where you only want output if it failed.
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=head1 EXAMPLE
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Give output for missing file:
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neno ls /missing-file
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No output if file exists:
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neno ls /bin/sh
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=head1 AUTHOR
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Copyright (C) 2017-2020 Ole Tange,
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http://ole.tange.dk and Free Software Foundation, Inc.
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=head1 LICENSE
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Copyright (C) 2012 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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at your option any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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=head1 SEE ALSO
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B<man>
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=cut
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_tmp=$(mktemp -d /tmp/no-error.XXXXX)
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true >$_tmp/stdout 2>$_tmp/stderr
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# Open the tmp-files for reading on file descriptor 21+22
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exec 21<$_tmp/stdout 22<$_tmp/stderr
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(
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# Unlink tmp-files (but keep them open)
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rm -rf $_tmp
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eval "$@"
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) >$_tmp/stdout 2>$_tmp/stderr
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_error=$?
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if [ $_error == 0 ] ; then
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# skip
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true
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else
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cat 0<&21
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cat 0<&22 >&2
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fi
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exit $_error
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