Given a keyboard command, how do you find the interactive function? [duplicate]

Question

I have a key sequence for C-u C-c . How would I find the function that's bound to it. I thought it was describe-key but that doesn't seem to work.

Cheers

Answer 1

describe-key is bound to C-h k.

If you want to know the function bound to C-u C-c ., you should consider that C-u is a prefix to C-c . and use just C-h k C-c ..

In this case, C-h k C-c . tells you that C-c . runs the command org-time-stamp and it also tells you what it does when called with a prefix argument:

If the user specifies a time like HH:MM or if this command is called with at least one prefix argument, the time stamp contains the date and the time. Otherwise, only the date is included.