Get help on a MEL command

To...	Do this
Show a short synopsis of command usage and flags.	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 Ctrl + Spacebar, or turn on Command > Show Tooltip Help to display auto-complete options automatically.

To...

Do this

Show a short synopsis of command usage and flags.

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 Ctrl + Spacebar, or turn on Command > Show Tooltip Help to display auto-complete options automatically.