if [ "$string1" != "$string2" ]; then echo "Strings are different." else echo "Strings are not different." fi 这是我们执行脚本时的结果: 代码语言:txt AI代码解释 $ ./test.sh Strings are different. 例3 我们可以与字符串一起使用的另一个运算符是-z,它允许我们测试字符串长度是否为 0。
if、else if后跟随的条件语句可以使用状态变量或者常规变量(状态变量:值的改变可以实时渲染UI,常规变量:值的改变不会实时渲染UI)。允许在容器组件内使用,通过条件渲染语句构建不同的子组件。...条件渲染语句在涉及到组件的父子关系时是“透明”的,当父组件和子组件之间存在一个或多个if语句时,必须遵守父组件关于子...
'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...
If it is false, the else statement is printed. We can utilize an if-else statement in one line in Bash. Before writing the script, we must add the Bash shell on Linux to run the Bash scripts. Using the Bash If-Else Statement in Linux We can use the case statements and if ...
Bonus: Bash if else statement in one line So far all the if else statement you saw were used in a proper bash script. That's the decent way of doing it but you are not obliged to it. When you just want to see the result in the shell itself, you may use the if else statements...
双分支if语句 if condition;then 条件为真执行的代码 else 条件为假执行的代码 fi 多分支if语句 if condition1;then condition1为真时执行的代码 elif condition2;then condition2为真时执行的代码 elif condition3;then condition3为真时执行的代码 ... ...
if语法更短 # One line # Note: The 3rd statement may run when the 1st is true [[ $var == hello ]] && echo hi || echo bye [[ $var == hello ]] && { echo hi; echo there; } || echo bye # Multi line (no else, single statement) ...
else 以上条件都为假的分支代码 fi 逐条件进行判断,第一次遇为“真”条件时,执行其分支,而后结束整个if。 (2)经典案例: ① 判断年纪 #!/bin/bash read -p "Please input your age: " age if [[ $age =~ [^0-9] ]] ;then echo "please input a int" ...
Theif,if...elseandif...elif...elsestatements allow you to control the flow of the Bash script’s execution by evaluating given conditions. If the condition evaluated to false, the code in the optionalelseclause will be executed. If you have any questions or feedback, feel free to leave...
else 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...