问在bash中使用内联if-statement添加命令参数ENexport export命令将会使得被 export 的变量在运行的脚...
if 判断条件; then statement1 statement2 ... fi 2 双分支的if语句: if 判断条件; then statement1 statement2 ... else statement3 statement4 ... fi 3 多分支的if语句: if 判断条件1; then statement1 ... elif 判断条件2; then statement2 ... elif 判断条件3; then statement3 ... else sta...
Example 2: Checking the “If -N” Statement with the “Test” Command Create a Bash file with the following script where the use of the “if –n” statement with the “test” command is shown. The first input is a string and the second input is numeric. If both input values are non...
If statement and else statement could be nested in bash. The keyword “fi” indicates the end of the inner if statement and all if statement should end with the keyword “fi”. The “if then elif then else fi” example mentioned in above can be converted to the nested if as shown belo...
双分支的if语句: if 判断条件;then statement1 statement2 ... else statement3 statement4 fi Note: if语句进行判断是否为空 [ "$name” = "" ] 等同于 [ ! "$name" ] [ -z "$name" ] Note: 使用if语句的时候进行判断如果是进行数值类的 ,建议使用 let(())进行判断 对于...
Using a Bash If Statement with multiple conditions Using Nested If Statements Common Pitfalls and Errors Incorrect usage of the single bracket command [ How to solve the Binary Operator Expected Error? Why you should not use the || and && operators instead of a Bash If Statement? Detailed Exam...
3. File and Directory Checks: -e: Exists -f: Regular file -d: Directory -r: Readable -w: Writable -x: Executable Example of using If Statement: Let’s illustrate the usage of if statements with a few examples: Example 1: Numeric Comparison ...
本教程将在 bash 脚本中使用 && 和if 语句。 在Bash 中使用 && 和if 语句 如果$age 等于18 且 $name 等于John,则条件返回真。 age=18 name="John" if [[ $age -eq 18 && "$name" == John ]];then printf "success!!\n" fi 输出: success!!
This article will walk you through the basics of the bash if...else statement and explain you how to use it in your shell scripts. Decision-making is one of the most fundamental concepts of computer programming. Like in any other programming language, if, if...else, if...elif...else,...
if语句的单分支结构: if 命令; then 命令; fi 注意:是否会执行then后面的命令,取决于if后面的命令的执行状态返回值; 1.如果返回值为真,则执行后面的命令; 2.如果返回值为假,则不执行后面的命令; 书写形式两种: if CONDITION ; then STATEMENT ... ...