Add git please

README.md

@@ -24,6 +24,7 @@ Table of Contents:
 
 ### Git
 * [Configuring using `git config`](git/configuring-using-git-config.md)
+* [Useful aliases: `push --force-with-lease`](git/useful-aliases-push-force-with-lease.md)
 
 ### Linux
 

git/useful-aliases-push-force-with-lease.md

+Useful aliases: `push --force-with-lease`
+===========================================
+
+>Git supports aliases, so we can create custom commands to execute git magic that
+>requires too much typing. Aliases can be set by defining them under the `alias`
+>section of our git config file.
+
+### git please
+```
+git config --global alias.please 'push --force-with-lease'
+```
+Pushing to a remote repository using the force option is dangerous. It basically
+rewrites the history by ignoring the upstream branch and replacing it's content
+with our local version. This means that any changes that have not been fetched
+by the local branch will be erased from history.
+
+This is where the option `--force-with-lease` comes in handy. It checks at least
+if the changes/history to be erased has been fetched, doing the force push in a
+more **polite** way: `git please`.