Programming Fundamentals/Files/PowerShell

files.ps1

# This program creates a file, adds data to the file, displays the file,
# appends more data to the file, displays the file, and then deletes the file.
# It will not run if the file already exists.
#
# References:
#     https://en.wikiversity.org/wiki/PowerShell/File_System

function Create-File($filename)
{
    Add-Content -Path $filename -Value "C`tF"
    for($celsius = 0; $celsius -le 50; $celsius++)
    {
        $fahrenheit = $celsius * 9 / 5 + 32
        $line = $celsius.ToString('0.0') + "`t" + $fahrenheit.ToString('0.0')
        Add-Content -Path $filename -Value $line
    }
}

function Read-File($filename)
{
    $content = Get-Content -Path $filename
    foreach ($line in $content)
    {
        Write-Output $line
    }
}

function Append-File($filename)
{
    for($celsius = 51; $celsius -le 100; $celsius++)
    {
        $fahrenheit = $celsius * 9 / 5 + 32
        $line = $celsius.ToString('0.0') + "`t" + $fahrenheit.ToString('0.0')
        Add-Content -Path $filename -Value $line
    }
}

function Delete-File($filename)
{
    Remove-Item -Path $filename
}

function Main()
{
    $filename = "~file.txt"
    if (Test-Path -Path $filename)
    {
        Write-Host 'File already exists.'
    }
    else
    {
        Create-File $filename
        Read-File $filename
        Append-File $filename
        Read-File $filename
        Delete-File $filename
    }
}

Main

Try It

Copy and paste the code above into one of the following free online development environments or use your own PowerShell compiler / interpreter / IDE.

Online

• There are some options, but none are fully functional at this time.

Windows

• Microsoft:Starting Windows PowerShell

macOS / Linux

• HowToGeek: How to Install Microsoft PowerShell on Linux or OS X

See Also

• Microsoft: Getting Started with PowerShell
• PowerShell

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