Windows editors, including ISE, tend to use a carriage return followed by linefeed (\r\n or `r`n) at the end of each line. Linux editors use linefeed only (\n or `n).

Line endings are less important if the only thing reading the file is PowerShell (on any platform). However, if a script is set to executable on Linux, a sha-bang must be included and the line-ending character used must be linefeed only.

For example, a created as follows named test.ps1 must use \n to end lines:

#!/usr/bin/env powershell 
Get-Process

The first line is the sha-bang and lets Linux know which parser to use when executing the shell script.

Once created, chmod may be used to make the script executable outside of PowerShell:

chmod +x test.ps1

After being made executable, the script may be executed from bash with the full path or a relative path:

./test.ps1

Windows editors, including ISE, tend to save files using what is commonly known as ANSI encoding; this is more correctly known as Windows-1252.

As Windows-1252 is a Microsoft native format, it may be more appropriate to save files in a universally accepted format such as UTF8.

Testing shows that PowerShell on Linux is forgiving about path separators; that is, Microsoft Windows uses the backslash (\), where Linux uses a forward slash (/).

If anything outside of PowerShell (including native commands) is to be used, a correct separator should be chosen.

The Join-Path command will merge path elements using the correct separator for each platform. Manual path construction (based on merging strings) should be avoided.

The following function uses the System.Net.NetworkInformation namespace to discover IPv4 address information. This allows us to return the same thing whether it is run on Windows or Linux.

If it were Windows only, we might have used WMI or the Get-NetIPConfiguration command. Creating something to work on both operating systems is more challenging:

function Get-IPConfig { 
    [System.Net.NetworkInformation.NetworkInterface]::GetAllNetworkInterfaces() | ForEach-Object { 
        $ipProperties = $_.GetIPProperties() 
             
        $addresses = $ipProperties.UnicastAddresses | 
            Where-Object { 
                $_.Address.AddressFamily -eq 'InterNetwork' 
            } | ForEach-Object { 
                "$($_.Address) $($_.IPv4Mask)" 
            } 
 
        $gateway = $ipProperties.GatewayAddresses.Address | 
            Where-Object { 
                $_.AddressFamily -eq 'InterNetwork' -and  
                $_ -ne '0.0.0.0' 
            } 
 
        [PSCustomObject]@{ 
            Name      = $_.Name 
            Id        = $_.Id 
            Addresses = $addresses 
            Gateway   = $gateway 
        } 
    } | Where-Object { $_.Addresses } 
} 
Get-IPConfig