ref: https://www.gnu.org/software/bash/manual/html_node/What-is-an-Interactive-Shell_003f.html
"An interactive shell is one started without non-option arguments, unles*s* -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." I'm a little confused about how all the and's and or's combine (I suppose it's obvious if you're a little more familiar with the material - but it would be great if it were possible to express this by indentation), but I'd actually decided to write in just to clarify that first line: "started without non-option arguments," Does "option arguments" mean "option*al* arguments"? If so, is the statement even correct? i.e. should it not be "started without optional arguments"? If the double-negative* is *actually correct, wouldn't the same sentiment be expressed by "started with only option(al?) arguments"? Double-negatives are inherently confusing, so it would be helpful to avoid them. -Mallika
