update all submodules.

Author: hemanth

README.md

@@ -47,6 +47,7 @@
 * [Before deleting untracked files/directory, do a dry run to get the list of these files/directories](https://github.com/git-tips/tips#before-deleting-untracked-filesdirectory-do-a-dry-run-to-get-the-list-of-these-filesdirectories)
 * [Forcefully remove untracked files](https://github.com/git-tips/tips#forcefully-remove-untracked-files)
 * [Forcefully remove untracked directory](https://github.com/git-tips/tips#forcefully-remove-untracked-directory)
+* [Update all the submoudles](https://github.com/git-tips/tips#update-all-the-submoudles)
 
 <!-- Don’t remove or change the comment below – that can break automatic updates. More info at <http://npm.im/doxie.inject>. -->
 <!-- @doxie.inject end toc -->
@@ -323,5 +324,10 @@ __Alternatives:__
 git clean -df
 ```
 
+## Update all the submoudles
+```sh
+git submodule foreach git pull
+```
+
 <!-- Don’t remove or change the comment below – that can break automatic updates. More info at <http://npm.im/doxie.inject>. -->
 <!-- @doxie.inject end -->

tips.json

@@ -182,5 +182,9 @@
     "title": "Forcefully remove untracked directory",
     "tip": "git clean -f -d",
     "alternatives": ["git clean -df"]
+  },
+  {
+    "title": "Update all the submoudles",
+    "tip": "git submodule foreach git pull"
   }
 ]