Add examples from the common screwups resource in #40 (#175)

* Adding submodule section

* Add the rest of the commands

README.md

@@ -80,12 +80,15 @@ For clarity's sake all examples in this document use a customized bash prompt in
   - [Finding](#finding)
     - [I want to find a string in any commit](#i-want-to-find-a-string-in-any-commit)
     - [I want to find by author/committer](#i-want-to-find-by-authorcommitter)
-  - [Miscellaneous Objects](#miscellaneous-objects)
+  - [Submodules](#submodules)
     - [Clone all submodules](#clone-all-submodules)
     - [Remove a submodule](#remove-a-submodule)
+  - [Miscellaneous Objects](#miscellaneous-objects)
+    - [Restore a deleted file](#restore-a-deleted-file)
     - [Delete tag](#delete-tag)
     - [Recover a deleted tag](#recover-a-deleted-tag)
     - [Deleted Patch](#deleted-patch)
+    - [Exporting a repository as a Zip file](#exporting-a-repository-as-a-zip-file)
   - [Tracking Files](#tracking-files)
     - [I want to change a file name's capitalization, without changing the contents of the file](#i-want-to-change-a-file-names-capitalization-without-changing-the-contents-of-the-file)
     - [I want to overwrite local files when doing a git pull](#i-want-to-overwrite-local-files-when-doing-a-git-pull)
@@ -117,12 +120,18 @@ Let's say that you just blindly committed changes with `git commit -a` and you'r
 (master)$ git show
 ```
 
-or
+Or
 
 ```sh
 $ git log -n1 -p
 ```
 
+If you want to see a file at a specific commit, you can also do this (where `<commitid>` is the commit you're interested in):
+
+```sh
+$ git show <commitid>:filename
+```
+
 <a name="#i-wrote-the-wrong-thing-in-a-commit-message"></a>
 ### I wrote the wrong thing in a commit message
 
@@ -1156,8 +1165,7 @@ $ git log --committer=<name or email>
 
 Keep in mind that author and committer are not the same. The `--author` is the person who originally wrote the code; on the other hand, the `--committer`, is the person who committed the code on behalf of the original author.
 
-<a name="miscellaneous-objects"></a>
-## Miscellaneous Objects
+## Submodules
 
 <a name="clone-submodules"></a>
 ### Clone all submodules
@@ -1184,6 +1192,23 @@ $ git rm --cached submodulename
 $ rm -rf .git/modules/submodulename
 ```
 
+<a name="miscellaneous-objects"></a>
+## Miscellaneous Objects
+
+### Restore a deleted file
+
+First find the commit when the file last existed:
+
+```sh
+$ git rev-list -n 1 HEAD -- filename
+```
+
+Then checkout that file:
+
+```
+git checkout deletingcommitid^ -- filename
+```
+
 <a name="delete-tag"></a>
 ### Delete tag
 
@@ -1220,6 +1245,12 @@ From github.com:foo/bar
  * [new ref]         refs/pull/1/head -> pr_1
 ```
 
+### Exporting a repository as a Zip file
+
+```sh
+$ git archive --format zip --output /full/path/to/zipfile.zip master
+```
+
 ## Tracking Files
 
 <a href="i-want-to-change-a-file-names-capitalization-without-changing-the-contents-of-the-file"></a>