Remove Top Line of Text File with PowerShell

Question

I am trying to just remove the first line of about 5000 text files before importing them.

I am still very new to PowerShell so not sure what to search for or how to

Answer 1

Inspired by AASoft's answer, I went out to improve it a bit more:

1. Avoid the loop variable $i and the comparison with 0 in every loop
2. Wrap the execution into a try..finally block to always close the files in use
3. Make the solution work for an arbitrary number of lines to remove from the beginning of the file
4. Use a variable $p to reference the current directory

These changes lead to the following code:

$p = (Get-Location).Path

(Measure-Command {
    # Number of lines to skip
    $skip = 1
    $ins = New-Object System.IO.StreamReader ($p + "\test.log")
    $outs = New-Object System.IO.StreamWriter ($p + "\test-1.log")
    try {
        # Skip the first N lines, but allow for fewer than N, as well
        for( $s = 1; $s -le $skip -and !$ins.EndOfStream; $s++ ) {
            $ins.ReadLine()
        }
        while( !$ins.EndOfStream ) {
            $outs.WriteLine( $ins.ReadLine() )
        }
    }
    finally {
        $outs.Close()
        $ins.Close()
    }
}).TotalSeconds

The first change brought the processing time for my 60 MB file down from 5.3s to 4s. The rest of the changes is more cosmetic.