rtfm - read the fucking manual
rtfm
None, you have to read the manual for an answer.
Used when lazy people ask simple questions adequately answered in the documentation, often in easy to locate parts of it.
/dev/null
Any.
Is a diagnostic. Since you are reading this you are getting the idea.
Polite people may also resolve the acronym using "fine".
Normally cried out in vain.
