\section exec exec - execute command in current process

\subsection exec-synopsis Synopsis
 <tt>exec COMMAND [OPTIONS...]</tt>

\subsection exec-description Description

\c exec replaces the currently running shell with a new command.
On successful completion, \c exec never returns. \c exec cannot be used
inside a pipeline.

\subsection exec-example Example

<tt>exec emacs</tt> starts up the emacs text editor, and exits \c fish.
When emacs exits, the session will terminate.
