exists/scripts/command-args2-test.sh

#!/bin/sh

# Test if the command builtin exits with the first missing executable with -v

# Copyright 2020 orbea
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

set -euf

printn () { eval "set -- $1"; printf %s\\n $#; }

rm -rf testdir

trap 'err=$?; rm -rf testdir; trap - EXIT; exit $err' EXIT INT

mkdir testdir
touch testdir/testfile1 testdir/testfile2 testdir/testfile3
chmod 0755 testdir/testfile1 testdir/testfile3

ORIGPATH="$PATH"
PATH=testdir

# Some shells return an error, others do not
cmd="$(command -v testfile1 testfile2 testfile3)" || :

PATH="$ORIGPATH"

test=
for i in $(printf %s "$cmd"); do
  test="${test} $i"
done

[ "$(printn "$test")" -gt 1 ] || exit 1

exit 0