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6.3.1 What is an Interactive Shell?

An interactive shell is one started without non-option arguments, unless -s is specified, without specifying the -c option, and 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.