Replacing characters from multiple files with regex and Powershell

Question

I would like to change _ to - in all .md files from folder FOO. The code below does what I need but I don't how to save results in folder FOO or some other...

$mdfiles = gci *.md
gc $mdfiles | ForEach-Object {if ( $_ -match '^!') {$_ -replace '_', '-'} else {$_}} | out-file ...

Thanks for the answer Santiago, Yes, I checked official documentation but there I can't find how to output multiple (100+) files after replacing to 100+ same or new files, not to single one. This command works fine if I try to change only one file. gc .\foo.md | ForEach-Object {if ( $_ -match '^!') {$_ -replace '_', '-'} else {$_}} | out-file foo1.md My last atempt was this, but this command also create only one file gc $mdfiles | ForEach-Object {if ( $_ -match '^!') {$_ -replace '_', '-'} else {$_}} | out-file $(".\" + $mdfiles.basename + "-new.md") — bloomer_xx
– bloomer_xx, Commented Feb 2, 2022 at 22:11

lit · Accepted Answer · 2022-02-02 22:47:28Z

1

A ForEach-Object is needed to iterate over the file names as well. Ternary expressions are in PowerShell Core, but I am not sure about Windows PowerShell. This is not tested, but might give a start.

Get-ChildItem -File -Path '.' -Filter '*.md' |
    ForEach-Object {
        $OutFile = ".\foo\$($_.Name)"
        Get-Content -Path $_.FullName |
            ForEach-Object { ($_ -match '^!') ? ($_ -replace '_','-') : ($_) } |
            Out-File -FilePath $OutFile
    }

Also, it is bad practice to use alias commands in a stored script.

answered Feb 2, 2022 at 22:47

lit

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