md5sum --check in PowerShell

md5sum.ps1

$md5sum = Get-Content '.\test.md5' | Select-String -Pattern '^([0-9a-fA-F]+) ([ \*])(.+)' | ForEach-Object { $hash,$binary, $path = $_.Matches[0].Groups[1..3].Value; [PSCustomObject] @{Hash=$hash; Binary=[Bool]($binary -eq '*'); Path=$path } }

$md5sum | ForEach-Object { if ($_.Hash.ToLower() -eq (Get-FileHash $_.Path -Algorithm MD5 -ErrorAction SilentlyContinue -ErrorVariable HashError).Hash) { "$($_.Path): OK" } else { if ($HashError) { "$HashError`n$($_.Path): FAILED open or read" } else { "$($_.Path): FAILED" } } }

differences:

original md5sum has different error output, e.g.

e:\bin\md5sum.exe: ..\file.bin: No such file or directory

original reports summaries:

e:\bin\md5sum.exe: WARNING: 1 of 3 listed files could not be read

e:\bin\md5sum.exe: WARNING: 1 of 2 computed checksums did NOT match