#!/bin/bash# change file's name# karlno 20080928function man{	echo "Usage: chname -c|-n|-d|-a path old_name [new_name]"	echo "option function"	echo " -c    replace old suffix by new one"	echo " -n    replace the string of filename by new one"	echo " -d    delete the string from the filename"	echo " -a    add the suffix to all files"	echo " -h    help"	echo "make by karlno"}if [ "$0" != "chname" ]; then					#check the program name exit 1fiif [ "$#" = 0 ]; then									#check the arg number man exit 1fiif [ "$1" = "-c" ] || [ "$1" = "-n" ] || [ "$1" = "-d" ] || [ "$1" = "-a" ]; then	if [ "$2" ] && [ -d "$2" ]; then		#check and open the path	 cd $2	elif [ ! "$2" ]; then	 echo "Please input path!"	 exit 1	else	 echo "Not found this path:\"$2\"!"	#the path not exist	 exit 1	fificase $1 in														#option-c)																		#eg.change ***.abc to ***.abb if [ "$3" ] && [ "$4" ]; then				#check arg  for filename in *.$3  do   mv "$filename" "${filename/.$3/.$4}"  done    else  echo "arg3 or arg4 err!"  exit 1 fi ;; -n)																		#eg.change **abc** to **abb** if [ "$3" ]; then										#check arg  for filename in *$3*  do   mv "$filename" "${filename/$3/$4}"  done else  echo "arg3 err!"  exit 1 fi ;; -d) if [ "$3" ]; then										#eg.change ***.abc to ***  for filename in *.$3  do   mv "$filename" "${filename/.$3/}"  done else  echo "arg3 err!"  exit 1 fi ;; -a) if [ "$3" ]; then										#add suffix  for filename in *  do    if [ "$filename" != "$0" ]; then   mv "$filename" "$filename.$3"   fi  done else  echo "arg3 err!"  exit 1 fi ;; -h)																		#display help man ;; *) man exit 1esac