Touch command in PowerShell

One of my favorite commands from the Linux terminal is the touch command. This is a way for users to create or modify files and their timestamp information. The following function is just a simple way to create an empty file or to update the Last Write Time attribute for a file.

In many of my scripts or starting a new project I need to create a temp file or a new file before opening it to begin the task at hand.

# Add nix-like touch command
Function touch
    $file = $args[0]

    if($file -eq $null) 
        Write-Host "No filename supplied"
        Write-Host ""
        Write-Host "Usage: touch file.txt"
        Write-Host "Will create file if it does not exist, and update the last modified time if it does."
        Write-Host "Similar to the unix command"

    if(Test-Path $file)
        # If file exists update the last write time to now.
        (Get-ChildItem $file).LastWriteTime = Get-Date
        # Create the file UTF-8 and with .NET classes to ensure compatibility
        [IO.File]::WriteAllLines("$pwd\$file", "")

This method is very basic and will create a blank file if it does not exist. That was the purpose of my Touch command. There are others out there which are a little more robust and similar to the Bash command.

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