exec - execute command in current process
Synopsis
exec COMMAND [OPTIONS...]
Description
exec replaces the currently running shell with a new command. On successful completion, exec never returns. exec cannot be used inside a pipeline.
Example
exec emacs starts up the emacs text editor, and exits fish. When emacs exits, the session will terminate.
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Licensed under the GNU General Public License, version 2.
https://fishshell.com/docs/3.1/cmds/exec.html