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Comment by jessant | Hacker News Reader

command wq <nop> command w <nop> command q <nop>

Unfortunately:

  E183: User defined commands must start with an uppercase letter

command W <nop>

cabbrev w <c-r>=(getcmdtype()==':' && getcmdpos()==1 ? 'W' : 'w')<CR>

cabbrev q <c-r>=(getcmdtype()==':' && getcmdpos()==1 ? 'W' : 'q')<CR>

cabbrev q! <c-r>=(getcmdtype()==':' && getcmdpos()==1 ? 'W' : 'q!')<CR>

cabbrev wq <c-r>=(getcmdtype()==':' && getcmdpos()==1 ? 'W' : 'wq')<CR>