What is an Interactive Shell? (Bash Reference Manual)
From Get docs
Bash/docs/latest/What-is-an-Interactive-Shell 003f
Next: Is this Shell Interactive?, Up: Interactive Shells [Contents][Index]
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.
