所以编写了一个小小的shell script,简化这些工作。代码、注释和说明都在一起了,应该不用再多解释了吧。 #! /bin/bash # 如果不输入参数,则提示命令的用法# 注意判断条件的这个表达式是用英文方括号[]包含的,# 并且[后面和]前面必须各有一个空格,没有的话会报错# 另外then必须另起一行,要不也报错# 输出的...
A Shell script usually needs to test if a command succeeds or a condition is met. In Bash, this test can be done with a Bash if statement. As with any other programming language, Bash comes with conditional expressions that allow you to test for conditions and alter the control flow if ...
一条简单的If语句返回alwayws false，如果我以用户或superuse的身份调用脚本manual，则语句为true：今天在...
I improved the script a little by adding a check on number of arguments. If there are no arguments or more than one argument, the script will output a message and exit without running rest of the statements in the script. Let’s do a few runs of the script to test it with various t...
Bash, short for "Bourne Again SHell," is a powerful scripting language used in Unix-based operating systems. One of the fundamental constructs in Bash programming is the if statement. The if statement allows you to control the flow of your script based on specific conditions. In this article...
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if语句 条件测试 bash条件判断之if语句(二) 练习19:写一个脚本:可以接受一个参数,其使用形式如下:script.sh {start|stop|restart|status}如果参数为start,创建空文件/var/lock/subsys/script,并显示“Starting script successfully.”;如果参数为stop,则删除文件/var/lock/subsys/script,并显示“Stop script if语...
Bash: If Bash scripts are used on the Linux operating system. These scripts carry out one or more commands. They are very powerful, however, as they support a number of features of programing languages. One of the major key words supported by Bash is the conditional statement, or if statem...
/bin/bash -xi=$1 #变量i的值取第1个参数的值iftest $i-gt89;then #如果i>89echo'A'elif test $i-gt79;then #如果i>79echo'B'elif test $i-eq60-o $i-gt60;then #如果i=60或i>60(即:i>=60) echo'C'elif test $i-gt0;then #如果i>0echo'D'elif test $i-lt0;then #如果i<0...
stocks update or stocks -u This will clone the repository and install the new versions of scripts that were installed, if you didn’t install a certain tool this script will not install the new version of that tool.UninstallingAUR pacman -Rns bash-snippets # or bash-snippets-git APT...