Name for the command line user interface employed by projects like Git

There are quite a few command line tools (or suites of tools) out there these days which use a command line interface such that every command starts with the name of the application/tool followed by a space and one of several available "subcommands". Git, for instance, has many different subcommands: "git status", "git init", "git fetch", "git commit", etc.

Just a few other projects I can think of which also use this pattern are:

• vagrant ("vagrant up", "vagrant destroy", "vagrant status")
• go(lang) ("go run", "go vet", "go fmt", "go build")
• svn ("svn checkout", "svn update", "svn commit")
• crosstool-ng ("ct-ng help", "ct-ng build", "ct-ng menuconfig")
• repo ("repo sync", "repo help", "repo init")

And this is far from a comprehensive list.

Some examples of command-line applications which do not use this pattern (but could if designed slightly differently):

• pacman (Arch Linux's package manager. Uses flag-style "subcommands" in contrast to the pattern about which I'm asking. "pacman -Q", "pacman -S", "pacman -R", etc)
• portage/"emerge" (Gentoo's package manager)
• ImageMagick (rather than separate subcommands, it uses separate commands. "convert", "import", "animate", "compare", "composite", etc)

My question is "is there a name specifically for this 'subcommand' style of command-line interface pattern and if so what is it?"