控制语句应用

shell支持的控制语句有break,continue,exit,shift

  • shift

    shift的作用是将位置参数参数左移一位，每执行一次shift，$2将变为$1,依次类推 [root@server0 programe]# chmod u+x shift_.sh [root@server0 programe]# ./shift_.sh one two three four five six seven eight one two three four five six seven eight [root@server0 programe]# cat shift_.sh #!/bin/bash for i in $@ do echo $1 shift done [root@server0 programe]#

  • continue用来在for,while，until循环中使用当前循环中断执行，进入下一次循环

  • break，终止整个for,while,until循环

  • exit用来结束脚本的运行

    [root@server0 programe]# cat con_p.sh #!/bin/bash for num in {1..100} do case $num in 1) continue ;; 5) break ;; esac echo ${num} done sleep 5 exit echo "……………………………………………………" [root@server0 programe]#