#!/bin/sh
KILL=false
ALL=false
while : ; do
case "$1" in
"-"*)
 case "$1" in
 "-k")
  KILL=true
  ;;
 "-a")
  ALL=true
  ;;
 "--")
  shift 1
  break
  ;;
 esac
 shift 1
 continue
 ;;
esac
break
done

if [ -z "${1:+s}" ];then echo >&2 "usage: pq [OPTS] PATTERN"
echo >&2 "   PATTERN to grep"
echo >&2 "   -a   all processes"
echo >&2 "   -k   to grep and kill"
echo >&2 "   --   OPTS end"
exit 1;fi
A=$(ps opid,command x$($ALL&&echo "a") --no-header |grep "$1" |awk '{ print $1; }')

A=$(echo "$A"|sed '/^'$$'$/d')
I=$(echo "$A"|awk '{ print "ps opid >/dev/null "$0"||printf \"%s\" "NR"\"d;\"" }'|sh)
A=$(echo "$A"|sed "$I")
e=$(echo "$A"|awk 'BEGIN{ i=0 } NR==2{ i=1 } END{ print i }')

{ ${A:+ps u $A}; }>&2
if [ $e != 0 ];then
echo >&2 "pq: 2 or more found"
exit 1;fi

if [ -z "${A:+s}" ];then echo >&2 "pq: 0 found"
exit 1;fi

if $KILL; then kill $A; fi