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32.4.6 Letting Readline Type For You

complete (<TAB>)
Attempt to perform completion on the text before point. The actual completion performed is application-specific. The default is filename completion.
possible-completions (M-?)
List the possible completions of the text before point. When displaying completions, Readline sets the number of columns used for display to the value of completion-display-width, the value of the environment variable COLUMNS, or the screen width, in that order.
insert-completions (M-*)
Insert all completions of the text before point that would have been generated by possible-completions.
menu-complete ()
Similar to complete, but replaces the word to be completed with a single match from the list of possible completions. Repeated execution of menu-complete steps through the list of possible completions, inserting each match in turn. At the end of the list of completions, the bell is rung (subject to the setting of bell-style) and the original text is restored. An argument of n moves n positions forward in the list of matches; a negative argument may be used to move backward through the list. This command is intended to be bound to <TAB>, but is unbound by default.
menu-complete-backward ()
Identical to menu-complete, but moves backward through the list of possible completions, as if menu-complete had been given a negative argument.
delete-char-or-list ()
Deletes the character under the cursor if not at the beginning or end of the line (like delete-char). If at the end of the line, behaves identically to possible-completions. This command is unbound by default.