In the command
line or Script Editor, type help <command
name>, for example:
help move
Show the Maya
Help for a command.
Go to the Help menu
and select MEL Command Reference.
Display auto-completion results for commands and object
paths as you type them in the script editor
In the Script Editor, turn on Command
> Command Completion and Object Path Completion.
Then type the first few letters of a command and press + ,
or turn on Command > Show Tooltip Help to
display auto-complete options automatically.