The core Git is often called "plumbing", with the prettier user
interfaces on top of it called "porcelain". You may not want to use the
plumbing directly very often, but it can be good to know what the
-plumbing does for when the porcelain isn't flushing.
+plumbing does when the porcelain isn't flushing.
Back when this document was originally written, many porcelain
commands were shell scripts. For simplicity, it still uses them as
convenient to organize your project with an informal hierarchy
of developers. Linux kernel development is run this way. There
is a nice illustration (page 17, "Merges to Mainline") in
-http://www.xenotime.net/linux/mentor/linux-mentoring-2006.pdf[Randy Dunlap's presentation].
+https://web.archive.org/web/20120915203609/http://www.xenotime.net/linux/mentor/linux-mentoring-2006.pdf[Randy Dunlap's presentation].
It should be stressed that this hierarchy is purely *informal*.
There is nothing fundamental in Git that enforces the "chain of
GIT
---
-Part of the linkgit:git[1] suite.
+Part of the linkgit:git[1] suite