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#!/bin/bash
cmd=${0##*/}
if [[ $1 = -h ]]; then
echo "Usage: $cmd PROG1 PROG2 PROG3..."
echo " $cmd -s PROG1 PROG2 PROG3..."
echo ""
echo "If \`-s' ISN'T given, print the first program name given that is"
echo "found in PATH."
echo ""
echo "If \`-s' IS given, print the first program name given that is"
echo "currently running. If no match is found, fall back to default"
echo "behavior."
exit 0
fi
if [[ $1 = -s ]]; then
shift
# Scan to find a running instance
for prog in "$@"; do
if [[ -n "$(pgrep "${prog%% *}")" ]]; then
printf -- '%s\n' "$prog"
exit 0
fi
done
fi
# Scan to find one that is installed
for prog in "$@"; do
if [[ -x "$(which "${prog%% *}" 2>/dev/null)" ]]; then
printf -- '%s\n' "$prog"
exit 0
fi
done
printf -- '%s\n' "$cmd: no suitable program found" >&2
exit 1
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