PowerShell: Convert File Line Ending

Here's functions to report or convert newline convention.

put this in your PowerShell Profile

function xah-select-line-ending-windows {

    # .DESCRIPTION
    # Accept a pipeline from the output of Get-ChildItem.
    # It output files whose line-ending is Windows CRLF.
    # .NOTES
    # Version: 2024-03-12
    # .EXAMPLE
    # dir -file -filter *html | xah-select-line-ending-windows
    # .LINK
    # http://xahlee.info/powershell/powershell_fix_newline.html

    Process {
        if (-not $MyInvocation.ExpectingInput) { Write-Host "No pipeline received."; return ; }
        $content = [IO.File]::ReadAllText($_);
        if ($content.contains("`r`n")) { $_ }
    }
}

function xah-select-line-ending-linux {

    # .DESCRIPTION
    # Accept a pipeline from the output of Get-ChildItem.
    # It output files whose line-ending is Unix or Linux or MacOSX's LF.
    # .NOTES
    # Version: 2024-03-12
    # .EXAMPLE
    # dir -file -filter *html | xah-select-line-ending-linux
    # .LINK
    # http://xahlee.info/powershell/powershell_fix_newline.html

    Process {
        if (-not $MyInvocation.ExpectingInput) { Write-Host "No pipeline received."; return ; }
        $content = [IO.File]::ReadAllText($_);
        if ((-not $content.contains("`r`n")) -and ($content.contains("`n"))) { $_ }
    }
}

function xah-select-line-ending-MacOS9 {

    # .DESCRIPTION
    # Accept a pipeline from the output of Get-ChildItem.
    # It output files whose line-ending is MacOS9's CR.
    # .NOTES
    # Version: 2024-03-12
    # .EXAMPLE
    # dir -file -filter *html | xah-select-line-ending-MacOS9
    # .LINK
    # http://xahlee.info/powershell/powershell_fix_newline.html

    Process {
        if (-not $MyInvocation.ExpectingInput) { Write-Host "No pipeline received."; return ; }
        $content = [IO.File]::ReadAllText($_);
        if ((-not $content.contains("`r`n")) -and ($content.contains("`r"))) { $_ }
    }
}

function xah-set-line-ending-linux {

    # .DESCRIPTION
    # Accept a pipeline from the output of Get-ChildItem.
    # Converts line-ending to unix/linux convention of LF.
    # .EXAMPLE
    # dir -file -filter *html | xah-set-line-ending-linux
    # version 2024-03-11
    # .LINK
    # http://xahlee.info/powershell/powershell_fix_newline.html

    Process {
        if (-not $MyInvocation.ExpectingInput) { Write-Host "No pipeline received."; return ; }
        $content = [IO.File]::ReadAllText($_);
        if ($content.contains("`r`n")) {
            Copy-Item $_ ($_.fullname + (Get-Date -Format "~yyyyMMddHHmm~"));
            $newContent = ($content -replace "`r`n", "`n");
            [IO.File]::WriteAllText($_, $newContent);
        }
        elseif ($content.contains("`r")) {
            Copy-Item $_ ($_.fullname + (Get-Date -Format "~yyyyMMddHHmm~"));
            $newContent = ($content -replace "`r", "`n");
            [IO.File]::WriteAllText($_, $newContent);
        }
    }
}

usage:

dir -file -filter *html | xah-select-line-ending-windows | xah-set-line-ending-linux