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