man page

bash, man command completion

What drives command completion (tab) in bash?

When I want: man rc-update and type man rc and then TAB, I don't get command completion.

Not all bash builtin commands have their man page

Having man pages for bash builtin commands is convenient.
man echo provides the man page for the bash command 'echo'.

Some/most builtin commands do not have their own man page.
e.g. man read give man 2 read, which is about a c++ library. There is no man page for man 1 read (bash's read).

The official bash documentation is unwieldy.

Currently, my info pages are broken: #5475: The Info node shell builtin commands in Info file /usr/share/info/ does not exist.

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