/bin/bash#pan(){if[$[RANDOM%11]-$15];thenecho" congritulation,you win."echo"$[RANDOM%11]"elif[$[RANDOM%11]-$25];thenecho"sorry ,you lose."echo"$[RANDOM%11]"elseecho"$[RANDOM%11]"exitfi}read-p"plesae guess big or small: "daxiaocase$daxiaoinbig)pan gt le;;small)pan le...
You can easily evaluate the options passed on the command line for a script using while loop: ... .. while getopts ae:f:hd:s:qx: option do case "${option}" in a) ALARM="TRUE";; e) ADMIN=${OPTARG};; d) DOMAIN=${OPTARG};; f) SERVERFILE=$OPTARG;; s) WHOIS_SERVER=$OPTARG...
while true:死循环有时候也有奇效,可与用户交互 #!/bin/bash while true do read -p "请输入yes退出:" KEY if [ $KEY = yes ] then break fi done echo "正常退出" 1 2 3 4 5 6 7 8 9 10 11 [root@localhost opt]# ./sixunhuan.sh 请输入yes退出:no 请输入yes退出:1 请输入yes退出:d...
whiletrue;doecho'helloword'done while 的使用案例 1. 循环输出1-10的数字 代码语言:javascript 代码运行次数:0 运行 AI代码解释 #!/bin/bashnum=1while[$num-le10]doecho $num num=$(($num+1))done 2. 使用while读文件并打印文件内容 用法一: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 whil...
while true # 冒号代表永远为真,无限循环 [root@openvpn day4]# cat user.sh #! /bin/bash count=0 while true do read -p "请输入正确的用户名:" user read -p "请输入正确的密码:" passwd if [ $user = "mm" ] && [ $passwd = "123" ];then ...
while true do echo "Hello Bash" sleep 5 done To add the delay of 5 seconds thesleepcommand is used. Bash while Loop with sleep Command The sleep command is used to add delay in the script. The delays control the execution of the instructions and create timeouts. ...
/bin/bashwhiletrue;doread-p"please input the menu:cpu,mem,disk,quit:"variablecase$variableincpu) lscpubreak;; mem) free-mbreak;; disk) fdisk-l /dev/[shv]d[a-z][0-9]break;;*) echo"error,again";; esac done 看一下效果 现在我们来编写一个服务框架:...
Shell scripting, specifically Bash scripting, is a great way to automate repetitive or tedious tasks on your systems. Why type when you can schedule and run ...
案例7:while和read实现逐行处理 [root@egon/]# cat 3.sh #!/bin/bash i=0 whilereadline do echo$i:$line leti++ done</etc/passwd 案例8:用while循环+case来制作一个简单的菜单功能 #!/bin/bash echo"script name: `basename $0`" echo"version 1.0...
,p Q 现在对有问题的文件运行它。 ed -s file.txt < script.ed 从脚本中删除,p,以使stdout的输出静音,或者如果您对输出满意的话。 如果需要in-place编辑,请从脚本中将Q更改为w。 应该给出与bash解决方案大致相同的结果,但是由于仍然不知道在第233行和第238行应该发生什么,所以该行以#EXTVLCOPT开头...