powershell - concatenate N text files and prepend filename to each line

Question

Powershell - easy question.

I want to concatenate N text files and prepend filename to each line. How to do same but have full path+filename? Each files should retain all text and line terminators as-is.

data1.txt

this is the text in
data1 file - hello

data2.txt

four score and
seven years ago

To get this file

output.txt

data1.txt: this is the text in
data1.txt: data1 file - hello
data2.txt: four score and
data2.txt: seven years ago

It will be something like this - but that actually works.

get-content c:\temp\data*.txt|foreach-object{$tmp=get-content $;$.basename+","+$tmp} > output.txt

Thanks

Answer 1

Try something like this:

$path = "c:\temp"
$out  = "c:\temp\output.txt"

Get-ChildItem $path -Filter data*.txt | % {
    $file = $_.Name
    Get-Content $_.FullName | % {
        "${file}: $_" | Out-File -Append $out
    }
}

Answer 2

Try this:

Select-String '^' data*.txt >output.txt

If you don't want the line numbers, remove them like this:

(Select-String '^' data*.txt) -replace '^([^:]*:)\d+:','$1' >output.txt

Edit: If you want just the filename without the path you could remove a leading path along with the line number like this:

(Select-String '^' data*.txt) -replace '^(.:[^:]*\\)?([^:]*:)\d+:','$2' >output.txt

or you could construct the output from the properties of the MatchInfo objects Select-String produces:

Select-String '^' data*.txt | % { "{0}:{1}" -f $_.Filename, $_.Line } >output.txt

Answer 3

This one worked for me:

ls c:\temp\data*.txt | foreach-object { $fname=[System.IO.Path]::GetFileName($_); get-content $_ | foreach-object { echo $fname": "$_ >> output.txt}}

Just make sure you delete output.txt if you need to run it again or if new data needs to be added.

inputs used from above, output.txt:

PS C:\> cat .\temp\output.txt
data1.txt: this is the text in
data1.txt: data1 file - hello
data2.txt: four score and
data2.txt: seven years ago