How it works…

Aliases are nothing but mappings that are done within PowerShell. The short words are mapped to PowerShell cmdlets; the cmdlets are recorded as Definition in each of the aliases. Aliases also support the same parameters as the cmdlet as well, since aliases are merely pointers to the right cmdlet. When you run anything on PowerShell, PowerShell checks its list of cmdlets and aliases (among other definitions) to understand what you are asking for. When PowerShell encounters an alias, it looks for which cmdlet it points to, and runs the cmdlet.

Using New-Alias, you can create a pointer with a custom name that points to the desired PowerShell cmdlet. When the custom cmdlets are exported as a script, the contents show New-Alias for each of the aliases available in the session.

Exporting aliases as CSV makes it easier to extend within a text editor if needed. The Import-Alias cmdlet understands that the first column in the CSV is the name of the alias, and that the second is its definition.