How to use the StreamReader class in Powershell to find and count number of characters contained in a file?

Question

I'm new to powershell and have no experience with .net. I have a script that use
(get-content | select-string -pattern -allmatches).matches | measure-object
to find and count how many characters in a file. My script will work fine if the file only contain less than a 10k rows. Otherwise for big file, the RAM will shoot up to 100% and then the Powershell will display (Not Responding)

I did some research and I found out system.io.streamreader will work, I read a couple of questions in Stackoverflow and to find and match the character or word in a file you just need do this:

$file = get-item '<file path>'

$reader = New-Object -TypeName System.IO.StreamReader -ArgumentList $file

[int]$line = 0

while ( $read = $reader.ReadLine() ) {

    if ( $read -match '<charcter>' ) {

        $line++

    }

}

but this is only returning the number of lines that contain the character, but not the number of characters in a file. So how do I use (select-string -inputobject -pattern -allmatches).matches | measure-object with the streamreader?

Sean · Accepted Answer · 2017-05-24 13:52:08Z

8

You can use ToCharArray and where to find the matches. For example, to count the number of "e" in the file you can say:

$file = get-item '<file path>'

$reader = New-Object -TypeName System.IO.StreamReader -ArgumentList $file

[int]$count = 0

while ( $read = $reader.ReadLine() ) {

    $matches = ($read.ToCharArray() | where {$_ -eq 'e'}).Count
    $count = $count + $matches
}

answered May 24, 2017 at 13:52

Sean

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