#!/bin/sh
# Returns 0 (success) if the given program is runnable.
#
# This is better than using [ -x /usr/bin/program ] because it avoids
# the need to hardcode the program's path; it searches $PATH instead.
#
if [ $# != 1 ]; then
  echo "usage: $0 <programname>" >&2
  exit 1
fi
type "$1" >/dev/null 2>&1