Finding the alias of a command:

get-alias -Definition "Get-Service"

Finding the command of an alias

Get-alias gsv

Help gsv

Finding the alias of a parameter (getting the alias of the computername parameter for ‘Get-EventLog’):

(get-command get-eventlog | select -ExpandProperty parameters) .computername.aliases

Finding the parameter of an alias (getting the parameter of the -Cn alias for ‘Get-EventLog’):

get-eventlog -Cn

(this will error with the error displaying the full parameter name of the Alias)