[gentoo-user] Change History of linux commands

[n952162]

Can anybody tell me how I can look at the official change history of
linux commands?

For example, the test(1) command used to have a regular-expression
parser built in.  No longer, and more surprising, there's no discussion
of its disappearance on the internet; that I can find, at any rate.

I'd to know when it disappeared and what discussions, by whom, preceded
that.