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\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.
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