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exec [ -cl ] [ -a argv0 ] [ command [ arg ... ] ]
Replace the current shell with command rather than forking. If
command is a shell builtin command or a shell function, the
shell executes it, and exits when the command is complete.
With -c clear the environment; with -l prepend - to the argv[0]
string of the command executed (to simulate a login shell); with
-a argv0 set the argv[0] string of the command executed. See
the section `Precommand Modifiers' in zshmisc(1).
If the option POSIX_BUILTINS is set, command is never inter-
preted as a shell builtin command or shell function. This means
further precommand modifiers such as builtin and noglob are also
not interpreted within the shell. Hence command is always found
by searching the command path.
If command is omitted but any redirections are specified, then
the redirections will take effect in the current shell.
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