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 …….. ...
就可以使用 if else 语句，它的格式为：ifconditionthenstatement1elsestatement2fi如果 condition 成立，...
Statement(s) to be executed if expression 1 is true elif [ expression 2 ] then Statement(s) to be executed if expression 2 is true elif [ expression 3 ] then Statement(s) to be executed if expression 3 is true else Statement(s) to be executed if no expression is true fi 二、if语...
shell执行了if行中的pwd命令。由于退出状态码是0,它就又执行了then部分的echo语句。 下面是另外一个例子。 1$catif-then2.sh2#!/bin/bash3#testing a bad command4ifIamNotaCommand5then6echo"it worked"7fi89echo"we are outside thie if statement"10$chmoda+xif-then2.sh11$ ./if-then2.sh12./...
1. How to use in if condition in shell script? To use an if condition in a shell script, you can follow the basic syntax of an if statement. Here’s an example: if[condition];then# code to execute if condition is truefi Copy ...
LinuxShell脚本for、while、case语句的应用 一、使用for循环语句1)for语句的结构 for变量名in取值列表 do 命令序列 done 执行流程: 首先将列表中的第1个取值赋给变量,并执行do……done循环体中的命令序列;然后将列表中的第2个取值赋给变量,并执行循环体中的命令序列……依次类推,直到列表中的所有取值都用完,最后...
In fact, we can also leave only single spaces around the&∧||operators: if ((COMMAND1 && COMMAND2) || COMMAND3) then EXPRESSIONS1 EXPRESSIONS2 fi Critically, the shell treatsthenas a statement, so we can only do with a single space after it: ...
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 ...
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...
2019-12-19 18:59 −if 语句的判断条件,从本质上讲,判断的就是命令的退出状态。 语句语句格式同一行书写注意点用例1用例2 if 语句 if conditionthen statement(s)fi if condition; then statement(s)... 声声慢43 0 590 Linux shell if条件判断1 ...