\section functions functions - print or erase functions

\subsection function-synopsis Synopsis
<tt>functions [-e] FUNCTIONS...</tt>

\subsection functions-description Description

This builtin command is used to print or erase functions.

- <tt>-e</tt> or <tt>--erase</tt> causes the specified functions to be erased.
- <tt>-n</tt> or <tt>--names</tt> List only the names of all defined functions

If \c functions is called with no arguments, the names and definition
of all functions are printed, otherwise, the specified function
definitions will be printed.