shell script是利用shell的功能所写的一个“程序”(program), 这个程序是使用纯文本文件,将一些shell的语法与命令(含外部命令)写在里面,搭配正则表达式、管道命令和数据流重定向等功能,以达到我们想要的处理目的。 shell script编写中的注意事项: 1、命令的执行是从上到下,从左到右地分析执行 2、命令与参数间的多...
COUNTER=0 while [ $COUNTER -lt 5 ] do COUNTER='expr $COUNTER+1' echo $COUNTER done 运行脚本,输出: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 1 2 3 4 5 while循环可用于读取键盘信息。下面的例子中,输入信息被设置为变量FILM,按<Ctrl-D>结束循环。 代码语言:javascript 代码运行次数:0 ...
#001-For循环 #语法格式#for 变量 in 列表#do#command#doneforloopin1 2 3 4 5doecho"The value is : $loop"done #002-While循环 #while command#do#Statement(s) to be executed if command is true#doneCOUNTER=0while[$COUNTER-lt5]doCOUNTER=`expr$COUNTER+ 1` echo$COUNTERdone #003-until循环 ...
for skill in Ada Coffe Action Java do echo "I am good at ${skill}Script" Done 如果不给skill变量加花括号,写成echo "I am good at $skillScript",解释器就会把$skillScript当成一个变量(其值为空),代码执行结果就不是我们期望的样子了。(推荐使用花括号) 只读变量:使用 readonly 命令可以将变量定义...
B.批处理(Batch):用户事先写一个Shell脚本(Script),其中有很多条命令,让Shell一次把这些命令执行完,而不必一条一条地敲命令。 Shell脚本和编程语言很相似,也有变量和流程控制语句,但Shell脚本是解释执行的,不需要编译,Shell程序从脚本中一行一行读取并执行这些命令,相当于一个用户把脚本中的命令一行一行敲到Shell提...
-rw-r--r--表示对我自己是 rw(可读可写);对 group 是 r(只读);对 user 也是 r(只读) shell script 的第一行是指定 bash 的位置,可以通过which bash命令还获取操作系统中 bash 的位置。所以shell 脚本中第一行一般为: #! /bin/bash 接着我们来输出一个 Hello world ...
To point out and clarify typical intermediate level semantic problems that cause a shell to behave strangely and counter-intuitively. To point out subtle caveats, corner cases and pitfalls that may cause an advanced user's otherwise working script to fail under future circumstances.See...
Anyone looking at this script should also look at the PowerShell script that was released by Microsoft as part of the Stream (Classic) migration tools. The PowerShell script released by Microsoft can be downloaded directly from Stream (Classic) admin page and also has a...
Change Service Log on with powershell script Change Shortuct Target path - Powershell Change SID on files & folders Change the location of an image manually in Powershell Change the value of an array element in ForEach loop? Changing contents of a text box multiple times in a powershell fo...
Hi I tried to write this script:For ($Counter = 0; $Counter -le 15; $Counter++) { Write-Host $Counter -ForegroundColor $Counter }How come the...