Syntax <condition> ? <if-true> : <if-false> 三元运算符的行为类似于简化if-else语句。 计算<condition>表达式,并将结果转换为布尔值,以确定接下来应计算哪个分支: 如果<condition>表达式为 true,则执行<if-true>表达式 如果<condition>表达式为 false,则执行<if-false>表达式 ...
# Start of script $x = 2; $y = 3 Get-Power $x $y # Function defined in script function Get-Power([int]$x, [int]$y) { if ($y -gt 0) { return $x * (Get-Power $x (--$y)) } else { return 1 } } # End of script 腳本中建立的變數範圍 $x 和$y 是該腳本的主體,...
If File exists then copy it script powershell If is not recognized as the name of a cmdlet? if not contains If statement based on day of the week evaluating despite being false If Test-Connection do these action else exit. If variable is null or empty skip in script If with multiple c...
Syntax复制 <statement> {-AND | -OR | -XOR} <statement> {! | -NOT} <statement> 使用逻辑运算符的语句返回布尔值 (TRUE 或 FALSE) 值。 PowerShell 逻辑运算符仅计算确定语句真实值所需的语句。 如果包含 和 运算符的语句中的左操作数为 FALSE,则不计算右操作数。 如果包含 或 语句的语句中的左操...
2.2 If statement <ifStatementRule> = ‘if’ ‘(‘ <pipelineRule> ‘)’ <statementBlockRule>[ ‘elseif’ ‘(‘ <pipelineRule> ‘)’ <statementBlockRule> ]* [ ‘else’ <statementBlockRule> ]{0 |1} 2.3 Switch statement # The syntax for a switch statement looks like: ...
$result = if(Get-Process -Name notepad) { "Running" } else { "Not running" } This technique is the equivalent of a ternary operator in other programming languages, or can form the basis of one if you’d like a more compact syntax. ...
null coalescing operator removes the need forifandelsestatements if you want to get the value of a statement if it’s not $null or return something else if it is $null. Note that this doesn’t replace the check for a boolean value of true or false, it’s only checking if the ...
However, what I have covered in this quick overview of regex syntax should be enough to get you started. Feel free to visit me anytime at www.ScriptingAnswers.com if you need help puzzling through an especially tricky regex.Don Jones is a contributing editor for TechNet Magazine and is the...
Ternary operator? <if-true> : <if-false> You can use the ternary operator as a replacement for theif-elsestatement in simple conditional cases. For more information, seeabout_If. Null-coalescing operator?? The null-coalescing operator??returns the value of its left-hand operand if it isn'...
PowerShell executes the begin statement when it loads your script, the process statement for each item passed down the pipeline, and the end statement after all pipeline input has been processed. 3. 采用main函数的script语句 function Main