If-statement-Bash-Script-Example if-else Statement 除了普通的 if 语句之外,我们还可以用 else 块扩展 if 语句。基本思想是,如果语句为真,则执行 if 块。如果语句为假,则执行 else 块。 Syntax : if [ condition_command ] then command1 command2 …….. last_command else command1 command2 …….. ...
1.1 if格式 if condition; then commands; fi 1.2 else if 和 else if condition; then...
In this example, the script first checks if ‘a’ is greater than ‘b’. If it’s not, it moves on to the ‘elif’ statement to check if ‘a’ is greater than ‘c’. If neither condition is met, it executes the ‘else’ statement, which in this case, prints ‘a is not greate...
2. Bash One-Liners While script files are the standard, sometimes we’re after an even simpler solution to a given task. In such cases, one-liners come in very handy.A one-liner is a single line of (Bash) code that executes an atomic task we may need to be done at a given mome...
When trying to understand the working of a function like if-else in a shell script, it is good to start things simple. Here, we initialize two variables a and b, then use the if-else function to check if the two variables are equal. The bash script should look as follows for this ...
else if-false fi 双分支语句跟单分支语句不同的地方在于else后面接的是CONDITION为假时的情况 同理else后面可以跟命令也可以跟语句嵌套。最后以fi结束if语句 ……… 示例:比较两个数的大小,如果第一个数大于等于第二个数则显示:First number is bigger,否则显示:Second...
if condition then # 执行的命令或代码块 elif another_condition then # 另一个条件满足时执行的命令或代码块 else # 所有条件都不满足时执行的命令或代码块 fi 优势 自动化决策:允许脚本根据不同的条件自动执行不同的操作。 简化复杂任务:通过条件判断,可以将复杂的逻辑分解为简单的步骤。 提高脚本灵活性:适应...
Yaml 文件中Condition If- else 判断的问题 在做项目的CI/ CD 时,难免会用到 Travis.CI 和 AppVeyor 以及 CodeCov 来判断测试的覆盖率,今天突然遇到了一个问题,就是我需要在每次做测试的时候判断是否存在一个环境变量,我对于 script 脚本半只半解还不太懂的状态,我最初的打算是这样写的...
/bin/bash #this is result error if libin then echo "this is error" fi if date then echo "this is success" fi echo "the are rhce" [22:43:42 root@libin3 libin]# ./shell21 ./shell21:行3: libin:未找到命令 this is rhcsa
a condition that is false. The syntax of the if statement in Bash is: if first-test-commands; then consequent-commands; [elif more-test-commands; then more-consequents;] [else alternate-consequents;] fi Tests commands in the bash if statement, and bash elif clauses, are executed in ...