OR列表 statement1 || statement2 || statement3 || …:允许执行一系列命令直到有一条命令成功为止,其后所有命令将不再被执行 #!/bin/sh 代码: touch file_one rm -f file_two if [ -f file_one ] && echo "hello" && [ -f file_two ] && echo " there" then echo "in if" else echo "in...
if 语句通过关系运算符判断表达式的真假来决定执行哪个分支。 Shell 有三种 if ... else 语句: if ... fi 语句; if ... else ... fi 语句; if ... elif ... else ... fi 语句。 语法格式: if [ expression ] then Statement(s) to be executed if expression is true fi ## 注意, expressio...
If you can enter commands into the shell, you can write shell scripts (also known as Bourne shell scripts). A shell script is a series of commands written in a ...
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...
if…elif…else…fi语句 1、if…else语句 代码语言:javascript 代码运行次数:0 运行 AI代码解释 if[expression]thenStatement(s)to be executedifexpression istruefi 注意:expression 和方括号([ ])之间必须有空格,否则会有语法错误。 if…else也可以写成一行,以命令的方式来运行,像这样: ...
Here is a basic example of theifstatement: PowerShell $condition=$trueif($condition) {Write-Output"The condition was true"} The first thing theifstatement does is evaluate the expression in parentheses. If it evaluates to$true, then it executes thescriptblockin the braces. If the value was...
Your shell script uses an "if" statement to see if the word "yes" was entered. This "if" statement looks like:A、if ( RESPONSE = "yes" ) ; thenB、if [ RESPONSE = "yes" ) ; thenC、if [ RESPONSE == "yes" ] ; thenD、if ( RESPONSE = "yes" ) ; then...
运行if语句时,PowerShell 会将<test1>条件表达式计算为 true 或 false。 如果<test1>为 true,<statement list 1>则运行,PowerShell 退出 语句if。 如果<test1>为 false,则 PowerShell 将计算条件语句指定的<test2>条件。 有关布尔计算的详细信息,请参阅about_Booleans。
if there is a problem where a command is legal but doesn't do what is intended, it can be a little harder to troubleshoot. A useful technique in this case (or in debugging anyshell script) is to use the “-x” shell option, which is available in all of the standard shells. Settin...
New-CMTSStepRunPowerShellScript -Name <String> [-SuccessCode <Int32[]>] [-Condition <IResultObject[]>] [-ContinueOnError] [-Description <String>] [-Disable] [-DisableWildcardHandling] [-ForceWildcardHandling] [-WhatIf] [-Confirm] [<CommonParameters>]Power...