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Library: GNU bash Command Reference (Darwin 9.0)

exec

exec: exec [-cl] [-a name] file [redirection ...]

Exec FILE, replacing this shell with the specified program.
If FILE is not specified, the redirections take effect in this
shell.  If the first argument is `-l', then place a dash in the
zeroth arg passed to FILE, as login does.  If the `-c' option
is supplied, FILE is executed with a null environment.  The `-a'
option means to make set argv[0] of the executed process to NAME.
If the file cannot be executed and the shell is not interactive,
then the shell exits, unless the shell option `execfail' is set.

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