To be picky, one also notices the man page says <packages>,
which means they are required:
aptitude [<options>...] {build-dep | build-depends | changelog |
download | forbid-version | hold | install | markauto | purge
| reinstall | remove | show | showsrc | source | unhold |
unmarkauto | versions} <packages>...
But for e.g., install, purge, that isn't actually the case.
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