Syntax <condition> ? <if-true> : <if-false> 三元运算符的行为类似于简化的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<if-true>表达式为 true,则执行<condition>表达式 如果<if-false>表达式为 false,则执行<condition>表达式 例如: P
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...
关键字 (keyword) else 是可选的。 语法: Syntax 复制 if (<condition>) {<statement list>} elseif (<condition>) {<statement list>} else {<statement list>} end 指定函数主体的一部分,以及 dynamicparam、 begin和end 关键字。 语句 end 列表在从管道收到所有对象后运行一次。 语法: Syntax 复制...
("DisplayName") # for each value which is not blank if ($null -ne $value -and $value -ne ""){ # The below if statement looks through the values discovered above in the uninstall Registry location and only for the programs defined in the variables above $DisplayVersion = $Read...
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. ...
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'...
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 ...
.EXAMPLE Copy-History (1..10+5+6) Copies commands 1 through 10, then 5, then 6, using PowerShell's array slicing syntax. #> param( ## The range of history IDs to copy [int[]] $Range ) Set-StrictMode -Version Latest $history = @() ## If they haven't specified a range, ...
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