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\section exec exec - execute command in current process
\subsection exec-synopsis Synopsis
\fish{syn}
exec COMMAND [OPTIONS...]
\endfish
\subsection exec-description Description
`exec` replaces the currently running shell with a new command.
On successful completion, `exec` never returns. `exec` cannot be used
inside a pipeline.
\subsection exec-example Example
`exec emacs` starts up the emacs text editor, and exits `fish`.
When emacs exits, the session will terminate.
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