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.\" onerror.1 - manual page for the errno command
.\" Copyright (C) 2009 Lars Wirzenius
.\"
.\" This program is free software: you can redistribute it and/or modify
.\" it under the terms of the GNU General Public License as published by
.\" the Free Software Foundation, either version 3 of the License, or
.\" (at your option) any later version.
.\"
.\" This program is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public License
.\" along with this program. If not, see <http://www.gnu.org/licenses/>.
.\"
.TH ONERROR 1
.SH NAME
onerror \- show command output if it failed
.SH SYNOPSIS
.B onerror
.I command
.IR arg ...
.SH DESCRIPTION
.B onerror
executes the command given on its command line.
It captures the standard output and error of the command,
and shows it only if the command failed.
The command failed if it returned a non-zero exit code.
.PP
This is handy for running commands via cron, when the commands
are chatty and have no way to tell them to be quiet unless they fail.
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