PowerShell中单引号(')和双引号(“)之间的区别?
在PowerShell中,单引号(')和双引号(“)之间没有这种区别。它类似于Python之类的编程语言。我们通常使用两个引号来打印语句。
示例
PS C:\> Write-Output 'This will be printed using Single quote'This will be printed using Single quote
PS C:\> Write-Output "This will be printed using double quote"
This will be printed using double quote
但是,当我们评估任何表达式或打印变量时,它会产生明显的不同。
$date = Get-DateWrite-Output 'Today date is : $date'
Today date is : $date
Write-Output "Today date is : $date"
Today date is : 11/02/2020 08:13:06
您可以在上面的示例中看到,单引号不能打印变量输出,而是打印变量的名称,而双引号可以打印变量的输出。即使我们尝试评估变量名,也不能使用单引号将其完成。
示例
PS C:\> Write-Output 'Today date is : $($date)'Today date is : $($date)
乘法运算的另一个例子
PS C:\> Write-Output "Square of 4 : $(4*4)"Square of 4 : 16
PS C:\> Write-Output 'square of 4 : $(4*4)'
square of 4 : $(4*4)
以使用数组打印多个语句为例。
示例
$name = 'Charlie'$age = 40
$str = @"
New Joinee name is $name
Her age is $age
"@
$str
输出结果
New Joinee name is CharlieHer age is 40
He will receive 1200 dollar bonus after 2 years
上面的输出可以正确打印,但是当我们使用单引号时,它不会打印变量名。
示例
$str = @'New Joinee name is $name
Her age is $age
He will receive $($age*30) dollar bonus after 2 years
'@
输出结果
New Joinee name is $nameHer age is $age
He will receive $($age*30) dollar bonus after 2 years
结论是,仅使用单引号来打印纯文本,但要打印变量并评估字符串中的其他表达式,请在PowerShell中使用双引号。
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