It's most common in Go's own tooling (e.g. `go build -buildmode`) but is also present in older tooling like e.g. GNU findutils (e.g. `find . -name something`).

It's most common in Go's own tooling (e.g. `go build -buildmode`) but is also present in older tooling like e.g. GNU findutils (e.g. `find . -name something`). The go tooling also has the irritating tendency to take a command like `go build --help` and say "oh, run `go help build` for details" instead of just printing out a list of possible options. Also: the details page doesn't always present you with a list of possible options, so you have to read each paragraph to see if there's an option relevant to your interests.