参考代码2:采用Shell数组的方法,同时检测多个URL是否正常,并给出专业的展示效果,这是实际工作中所用的脚本。 复制[root@zabbix 0510]# cat while_url.sh#!/bin/bash# this script is creacted by moox.# e_mail:2144865225@qq.com# function:case example# version:1.2. /etc/init.d/functions check_count...
for变量名in取值列表do命令 done 语法二: for ((expr1;expr2;expr3));do 命令列表 done 实例: #提前准备好用户的文件[root@VM_0_10_centos shellScript]#vi username.txttest01 test02 test03 test04 test05 test06#vi example.sh#!/bin/bashread -p"请输入用户密码:"PASSWDforUNAMEin`cat username.t...
The while loop is one of the fundamental flow control components of programming. In shell scripting, the loop is used for various purposes such as finding the number of items in a directory and the number of lines in a file. Further, the infinite while loop is used for testing and debuggi...
Of course, if this was something that you would repeatedly do, you should run it from a script, use proper names for the variables, and all those good practices (including transforming the filename in an argument and defining where to send the output, but today, the topic iswhileloops). ...
2. Awk Do While Loop Example: Print the message at least once $ awk 'BEGIN{ count=1; do print "This gets printed at least once"; while(count!=1) }' This gets printed at least once In the above script, the print statement, executed at least once, if you use the while statement,...
In the above code snippet, the for loop generates the random number at max number of times. RANDOM is an internal bash function that returns a random integer at each invocation. Bash While Loop Another iteration statement offered by the shell programming language is the while statement. ...
...Debian曾经采用/bin/bash更改/bin/dash,目的使用更少的磁盘空间、提供较少的功能、获取更快的速度。但是后来经过shell脚本测试存在运行问题。...因为原先在bash shell下可以运行的shell script (shell 脚本),在/bin/sh下还是会出现一些意想不到的问题,不是100%的兼用。
PowerShell Copy while($val -ne 3) { $val++ Write-Host $val } In this example, the condition ($val is not equal to 3) is true while $val is equal to 0, 1, and 2. Each time through the loop, $val is incremented by 1 using the ++ unary increment operator. The last time ...
Did you know that there arespecial variables in bash? Yep, there are 9 types of special variables in bash. Want to know what they are and how to use them? Here you go: Special Variables in Bash Shell [With Script Examples] The bash shell has some special variables that have specific ...
and tools). In the first example, we see an example where the databases are consistent. When you examine the output, you will see each object is inspected in three passes. First, the object definitions are compared. Any discrepancies would be displayed as a difference in their CREATE statemen...