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#!/bin/bash
# run a command, sending stdout to one file and stderr to another,
# but also sending both to this process' stdout/stderr, respectively
if [ "$3" = "" ]; then
echo "usage: $0 stdout-file stderr-file cmd [args..]"
exit 0
fi
stdoutFile="$1"
stderrFile="$2"
command="$3"
shift
shift
shift
result=0
handler() {
# this signal means the underlying command exit erroneously,
# though we don't know the code
echo "The command failed!"
result=2
}
trap handler SIGUSR1
# dup my stdout/err on fd 3,4
exec 3>&1
exec 4>&2
# run the command with tees to duplicate the data
mypid=$$
# echo "mypid = $mypid, command=$command, args=$@, stdout=$stdoutFile, stderr=$stderrFile"
(("$command" "$@" || kill -s USR1 $mypid) | tee "$stdoutFile" >&3) 2>&1 | tee "$stderrFile" >&4
exit $result
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