#!/bin/sh
hxtoh()
{
flag=1
while read -r str; do
case $str in
HXCOMM*)
;;
SRST*|ERST*) flag=$(($flag^1))
*)
test $flag -eq 1 && printf "%s\n" "$str"
esac
done
}
case "$1" in
"-h") hxtoh ;;
*) exit 1 ;;
esac < "$2"
exit 0