#!/bin/bash
# m4.sh: m4 ¸ÅÅ©·Î ÇÁ·Î¼¼¼­ ¾²±â.

# ¹®ÀÚ¿­
string=abcdA01
echo "len($string)" | m4                       # 7
echo "substr($string,4)" | m4                  # A01
echo "regexp($string,[0-1][0-1],\&Z)" | m4     # 01Z

# »ê¼ú½Ä
echo "incr(22)" | m4                           # 23
echo "eval(99 / 3)" | m4                       # 33

exit 0