Writing a shell in Rust

Good Bash started as a way to learn systems programming without a toy tutorial. A shell is small enough to finish and sharp enough to hurt: process spawning, PATH lookup, and a terminal that does not fight you.

Raw mode was the first real problem. Cursor movement and an editable buffer are easy to describe and annoying to get right. Tab autocomplete came later, once the REPL felt like a tool instead of a demo.

Rust helped. Ownership made the process model clearer, and the type system caught mistakes I would have shipped in a scripting language. The shell is still v1, but it runs real commands, and that was the point.