else echo "x does not equal 5." fi or we can enter it directly at the command line (slightly shortened): 或者我们可以直接在命令行中输入以上代码(略有缩短): 代码语言:javascript 代码运行次数:0 运行 AI代码解释 [me@linuxbox ~]$ x=5 [me@linuxbox ~]
ifconditionthencommand1 command2...commandNfi 写成一行(适用于终端命令提示符): if[$(ps-ef|grep-c"ssh")-gt1];thenecho"true";fi 末尾的 fi 就是 if 倒过来拼写,表示 if 结束。 (2)if else 语法格式: ifconditionthencommand1 command2...commandNelsecommandfi (3)if else-if else 语法格式: if...
If (condition) then echo "do this stuff" elseif (condition) echo "do this stuff" elseif (condition) echo "do this stuff" if(condition) then echo "this is nested inside" else echo "this is nested inside" else echo "not nested" Unix shell查找最大值和最小值并从文件中打印行 从shell...
One of the most important parts of conditional programming is the if-else statements. An if-else statement allows you to execute iterative conditional statements in your code. We use if-else in shell scripts when we wish to evaluate a condition, then decide to execute one set between two or...
Bash是一种常用的Unix shell和脚本语言,用于在Linux和其他类Unix系统上进行命令行操作和脚本编写。Bash提供了丰富的控制结构,包括循环和条件语句,其中包括带有If和Elif逻辑中断的For循环。 For循环是一种重复执行特定任务的控制结构,它可以遍历一个列表或者一系列的值。在Bash中,可以使用For循环来遍历数组、文件中的行...
在Unix/Linux shell中,if 是一种流程控制语句,用于根据条件执行不同的代码块。以下是 if 语句的一般语法: if [ condition ]; then # Code to be executed if the condition is true fi if [ condition ]; then # Code to be executed if the condition is true else # Code to be executed if the ...
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This is a modal window. No compatible source was found for this media. ageage}elseif(age<21){printf("You need to be over 21\n");}else{printf("You are over 18 and older than 21 so you can continue \n");}} Output Run the code and check its output − ...
As we’ve already seen, basicif–elsestatements conform to thePOSIXstandard: if COMMAND then EXPRESSIONS elif COMMAND then EXPRESSIONS else EXPRESSIONS fi This structure is far from a single line. Moreover, we can have many lines inEXPRESSIONS. On top of that, we can expandCOMMANDwith the()...
Ruby If Else Statement - Learn how to use if-else statements in Ruby programming to control the flow of your code effectively.