read -p "Enter the number: " num if [ $num -lt 0 ]; then echo "Number $num is negative" elif [ $num -gt 0 ]; then echo "Number $num is positive" else echo "Number $num is zero" fi 让我运行它来涵盖这里的所有三种情况: Running a script with bash elif statement 用逻辑运算符...
if..else 语句 if..elif..else 语句 嵌套if 语句 多重条件 test 操作 结论 库存译文,原文翻译于 2021/02/21,译文以 CC BY-NC-SA 4.0 协议公开。如果译文侵权,麻烦提供著作权所有人证明并联系本人,本人会在第一时间删除。本文仅供学习、研究用。 原文地址:Bash if..else Statement原文作者:linuxize译者:霜...
'Else if'in bash scripting, often written as'elif', is used to check multiple conditions in your code. It is used with the syntax,if [firstStatement]; then... elif [secondCondition]; then... else. It’s a powerful tool that allows your scripts to make decisions based on various scen...
As you can see, the script is better as it also tells you if the number is odd. Use elif (else if) statement Here's a script that checks whether the given number is positive or negative. In mathematics, 0 is neither positive nor negative. This script keeps that fact in check as wel...
statement5 fi You can use this if .. elif.. if , if you want to select one of many blocks of code to execute. It checks expression 1, if it is true executes statement 1,2. If expression1 is false, it checks expression2, and if all the expression is false, then it enters into...
if[$num-lt0];then echo"Number $num is negative" elif[$num-gt0];then echo"Number $num is positive" else echo"Number $num is zero" fi 让我运行它来涵盖这里的所有三种情况: Running a with bash elif statement 用逻辑运算符组合多个条件 ...
如果这样,那就那样,否则就……。还不明白吗?了解了 Bash Shell 脚本中的 if-else 语句后就明白了。Bash 支持 if-else 语句,以便你可以在 shell 脚本中使用逻辑推理。 通用的 if-else 语法如下: 复制 if [ expression ]; then ## 如果条件为真则执行此块,否则转到下一个 elif [ expression ]; then ##...
if condition then statements [elif condition then statements. ..] [else statements ] fi 1. 和C程序不一样,bash的判断不是通过boolean,而是通过statement,也就是执行命令后的最终状态(exit status)。所有的Linux命令,无论你是代码是C还是脚本,执行完,都返回一个整数通知他的调用这,这就是exit status,通常0...
if/else是通过判断选择执行或者执行部分代码,可以根据变量、文件名、命令是否执行成功等很多条件进行判断,他的格式如下:if condition then statements [elif condition then statements. ..] [else statements ] fi和C程序不一样,bash的判断不是通过boolean,而是通过statement,也就是执行命令后的最终状态(exit status)...
If[conditional expression1]then statement1 statement2.elseif[conditional expression2]then statement3.fi fi if 语句和 else 语句可以嵌套在 bash 中。关键字“fi”表示内部 if 语句的结束,所有 if 语句都应以关键字“fi”结束。 上面提到的“if then elif then else fi”示例可以转换为嵌套的if,如下所示。