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How to add, use and delete remotes, using Linux kernel source repo as an example.

Currently one remote:

$ git remote -v
origin	https://github.com/torvalds/linux.git (fetch)
origin	https://github.com/torvalds/linux.git (push)
$

Query linux-next before adding it as a remote:

$ git ls-remote https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git

Add as a new remote with name ln:

$ git remote add ln https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git

There are no new branches yet:

$ git branch -a
* master
  remotes/origin/HEAD -> origin/master
  remotes/origin/master
$

But we have a new registered remote:

$ git remote -v
ln	https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git (fetch)
ln	https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git (push)
origin	https://github.com/torvalds/linux (fetch)
origin	https://github.com/torvalds/linux (push)
$

Count the current objects:

$ git count-objects -v
count: 0
size: 0
in-pack: 6542717
packs: 1
size-pack: 2684971
prune-packable: 0
garbage: 0
size-garbage: 0
$

Fetch:

$ git fetch ln
remote: Counting objects: 43368, done.
remote: Compressing objects: 100% (16663/16663), done.
remote: Total 43368 (delta 32248), reused 36955 (delta 26665)
Receiving objects: 100% (43368/43368), 36.62 MiB | 23.38 MiB/s, done.
Resolving deltas: 100% (32248/32248), done.
From https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next
 * [new branch]                akpm          -> ln/akpm
 * [new branch]                akpm-base     -> ln/akpm-base
 * [new branch]                master        -> ln/master
 * [new branch]                pending-fixes -> ln/pending-fixes
 * [new branch]                stable        -> ln/stable
 * [new tag]                   next-20190306 -> next-20190306
$

Count objects again:

$ git count-objects -v
count: 0
size: 0
in-pack: 6586085
packs: 2
size-pack: 2723660
prune-packable: 0
garbage: 0
size-garbage: 0
$