получить строку от пользователя с редактированием (get a line from a user with editing)
NOTATION
An Emacs-style notation is used to denote keystrokes. Control
keys are denoted by C-key, e.g., C-n means Control-N. Similarly,
meta keys are denoted by M-key, so M-x means Meta-X. (On
keyboards without a meta key, M-x means ESC x, i.e., press the
Escape key then the x key. This makes ESC the meta prefix. The
combination M-C-x means ESC-Control-x, or press the Escape key
then hold the Control key while pressing the x key.)
Readline commands may be given numeric arguments, which normally
act as a repeat count. Sometimes, however, it is the sign of the
argument that is significant. Passing a negative argument to a
command that acts in the forward direction (e.g., kill-line)
causes that command to act in a backward direction. Commands
whose behavior with arguments deviates from this are noted below.
When a command is described as killing text, the text deleted is
saved for possible future retrieval (yanking). The killed text
is saved in a kill ring. Consecutive kills cause the text to be
accumulated into one unit, which can be yanked all at once.
Commands which do not kill text separate the chunks of text on
the kill ring.
