Add pushing to multiple remotes

README.md

@@ -25,6 +25,7 @@ Table of Contents:
 
 ### Git
 * [Configuring using `git config`](git/configuring-using-git-config.md)
+* [Pushing to multiple remote repos](git/pushing-to-multiple-remote-repos.md)
 * [Useful aliases: `push --force-with-lease`](git/useful-aliases-push-force-with-lease.md)
 
 ### Linux

git/pushing-to-multiple-remote-repos.md

+Pushing to multiple remote repos
+================================
+
+Multiple remote URLs can be set to the same remote using the `remote set-url REMOTE_NAME --STREAM --add REMOTE_URL`
+command. For example, say we want to assign two different URLs `git@github.com:sadmansk/til.git` (as a `push`
+mirror) and `git@git.sadmansk.com:sadmansk/til.git` (original repo) to the same remote `origin`, we can issue
+the following commands:
+
+```
+$ git remote add origin git@git.sadmansk.com:sadmansk/til.git
+$ git remote set-url origin --push --add git@github.com:sadmansk/til.git
+$ git remote set-url origin --push --add git@git.sadmansk.com:sadmansk/til.git
+```
+> Leaving out `--push` will make the remote `pull`-able, which might not be safe.
+
+We can check the current list of URLs attached to all the remotes:
+```
+$ git remote -v
+origin  git@git.sadmansk.com:sadmansk/til.git (fetch)
+origin  git@github.com:sadmansk/til.git (push)
+origin  git@git.sadmansk.com:sadmansk/til.git (push)
+```