cheatsheets/bash.md

 # Bash Cheat Sheet
 
+These are a list of commands that work in any bash shell.
+They will also work in any UNIX or UNIX-like environment (e.g. a OSX terminal, a Linux terminal).
+
+## Cheat Sheet
+
 | **Command** | **Description** | **Invocation** |
 | ----------------- | --- | --- |
 | `pwd` | Outputs your current directory. | `pwd` |
@@ -8,4 +13,22 @@
 |      | Lists the contents of a directory. | `ls /path/to/dir` |
 | `rm` | Deletes a file. | `rm /path/to/file` |
 |      | Deletes a directory. | `rm -rf /path/to/directory` |
+| `cp` | Copys a file. | `cp /path/to/src /path/to/dst` |
+|      | Copys a directory. | `cp -r /path/to/src /path/to/dst` |
 | `mv` | Moves a file or directory. | `mv /path/to/src /path/to/dst` |
+| `mkdir` | Creates a directory. | `mkdir /path/to/dir` |
+| `touch` | Creates a file. | `touch /path/to/file` |
+
+## On `~`, `.`, and `..`
+
+In a UNIX environment, there are a few symbols that carry specific meanings.
+The first is `~` which signifies your *home* directory.
+For example, if you run `ls ~` you will list the contents of your home directory.
+The second is `.` which represents the current directory.
+Running `cp ~/HelloWorld.java .` will copy `HelloWorld.java` from your home directory into the current directory.
+The third is `..` which represents the directory above the current directory.
+To move into the directory above the current directory, we run `cd ..`.
+
+[Return to Cheat Sheet index](index)
+
+[Return to Bash and Git index](../home)