Shell脚本用for循环遍历参数的方法技巧

#!/bin/bashnumber=65       #定义一个退出值index=1          #定义一个计数器if [ -z "$1" ];then              #对用户输入的参数做判断，如果未输入参数则返回脚本的用法并退出，退出值65  echo "Usage:$0 + canshu"  exit $numberfiecho "listing args with /$*:"         #在屏幕输入，在$*中遍历参数for arg in $*                     do  echo "arg: $index = $arg"           let index+=1doneechoindex=1                       #将计数器重新设置为1echo "listing args with /"/$@/":"    #在"$@"中遍历参数for arg in "$@"do  echo "arg: $index = $arg"  let index+=1done

#!/bin/bashnumber=11if [ $# -eq 0 ];then  echo "Usage: $0 + canshu"  exit $numberfifor i in $*        #在$*中遍历参数，此时每个参数都是独立的，会遍历$#次do  echo $idoneechofor i in "$*"      #在"$*"中遍历参数，此时"$*"被扩展为包含所有位置参数的单个字符串，只遍历一次do  echo $idone

#!/bin/bashnumber=11if [ $# -eq 0 ];then  echo "Usage: $0 + canshu"  exit $numberfifor i in $@do  echo $idoneechofor i in "$@"do  echo $idone