Powershell: split the line into a new line, then use -contains

Question

$a = {aa
bb
cc}
$a = $a -split "`n"
$a -contains "aa"

This returns false when the string "aa" appears to be on the list. Why is this?

Answer 1

To complement Kory Gill’s useful answer , which suggests that the problem may be that there are CRLF ( "`r`n") line endings in the input , in this case -split "`n"(splitting into LF only) will leave the resulting array elements with ending CR ( "`r"), resulting in "aa"not will be found using -contains, since the actual value "aa`r".

Windows Unix :

$a -split '\r?\n' # split $a into lines, whether it has CRLF or LF-only line endings

^{\r?\n ( ), LF (\n), (?), CR (\r).
\r \n PowerShell `r `n ( ).}

, PowerShell , :

• Windows LF (\n).

• CRLF (\r\n) LF (\n), PowerShell , .

  • , script , : script - script -block, { } - .

---

: [Environment]::NewLine , (-) : "`r`n" Windows, "`n" Unix- , , , , , .

Answer 2

, `n , , ` r`n Windows.

:

$a = $a -split "`r`n"

Answer 3

Crossing Solution Platform:

$a = $a -split [System.Environment]::NewLine