Before building chmod Calculator, we looked at how existing chmod tools handle Unix's special permission bits — setuid, setgid, and the sticky bit.
The basic tool and the "Pro" tool aren't the same tool
Researching existing chmod calculators turned up a recurring pattern: special permission bits show up specifically in tools branded "Pro" or "Advanced" — separate from the plain checkbox calculator most people land on first. If the file you're working with needs setuid, setgid, or a sticky bit, you may not find out the basic tool can't do it until you're already looking for the numeric value by hand.
One calculator, not two tiers
This tool includes setuid, setgid, and sticky bit checkboxes from the start, alongside the standard read/write/execute grid — no separate advanced version to find. Toggle any of it, or type an octal (4755) or symbolic (rws) value directly, and everything else — the checkboxes, the other notation, and a complete, ready-to-copy chmod command — stays in sync.
A command you can actually run
Beyond the octal and symbolic values, the tool builds the full command — including an optional -R for recursive changes — so there's no manual assembly step before you paste it into a terminal.
