#!/bin/bash if [ -f Makefile.unx ]then  printf "Already in Win32 mode\n"  exit 1fi printf "Renaming all Makefile to Makefile.unx\n" for file in $(find -name Makefile -print)do  printf '%s\n' $file  mv $file ${file}.unxdone printf "Renaming all Makefile.w32 to Makefile\n" for file in $(find -name Makefile.w32 -print)do  printf '%s\n' $file  mv $file ${file%.w32}done