Command Line Editing
Readline Interaction
The following paragraphs describe the notation used to represent keystrokes.
The text C-K is read as `Control-K' and describes the character
produced when the K key is pressed while the Control key
is depressed.
The text M-K is read as `Meta-K' and describes the character
produced when the meta key (if you have one) is depressed, and the K
key is pressed. If you do not have a meta key, the identical keystroke
can be generated by typing ESC first, and then typing K.
Either process is known as metafying the K key.
The text M-C-K is read as `Meta-Control-k' and describes the
character produced by metafying C-K.
In addition, several keys have their own names. Specifically,
DEL, ESC, LFD, SPC, RET, and TAB all
stand for themselves when seen in this text, or in an init file
(see Readline Init File).