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An interactive shell
is one started without non-option arguments
(unless -s is specified)
and without specifying the -c option,
whose input and error output are both
connected to terminals (as determined by isatty(3)),
or one started with the -i option.
An interactive shell generally reads from and writes to a user’s terminal.
The -s invocation option may be used to set the positional parameters when an interactive shell is started.