Merge pull request #55 from ruthshemla/master

Intro to command line by Becky Smith and Ruth Shemla

SUMMARY.md

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 # Summary
 
 * [How the Internet works?](how_internet_works/README.md)
+* [Intro to Command Line](intro_to_command_line/README.md)
 * [Python installation](python_installation/README.md)
 * [Introduction to Python](python_introduction/README.md)
 * [What is Django?](django/README.md)

intro_to_command_line/README.md

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+# Introduction to Command Line
+
+
+## Introduction
+Hey girls, the following steps will show you how to use the black window.  This window is also called the "command line", "cmd", "prompt" and "terminal".
+
+Each operating system has a set of commands for the command line.
+Here is a summary of some useful commands:
+
+| Command (Windows)      | Command (Mac OS / Linux)    | Description | Example|
+| ------------- |-----------|-------------| -----|
+| exit    | exit | close the window | **exit** |
+| cd      | cd   | change directory      |   **cd test** |
+| dir     | ls   |list folders/files      | **dir** |
+| copy    | cp   | copy file | **copy c:\test\test.txt c:\windows\test.txt** |
+| move | mv | move file | **move c:\test\test.txt c:\windows\test.txt** |
+| md | mkdir | create a new folder | **md testfolder** |
+|del | rm | delete a folder/file | **del c:\test\test.txt**
+For more about the above commands,  check out the Further Information section below.
+
+These are just a very few of the possible black window commands.
+[ss64.com](http://ss64.com) contains a complete reference of commands for all operating systems.
+
+## Useful shortcuts
+
+* Up arrow - rerun previous commands.  You can avoid typing the same commands again by using the up arrow key to rerun recently used commands.
+
+
+* Tab key - the tab key will autocomplete folder and file names. For example, typing **dir t ** + Tab will autocomplete to all directories starting with t in the current directory (such as task, test, tutorial).
+
+
+## Further information about the commands above
+
+* The **exit** commmand - this will cause the window to close; it makes sense, right? No need to explain too much ...
+
+
+* The **cd** command - this command allows you to change your current directory. To use the cd command you type cd directoryname and press enter.
+For example if you are in a directory called c:\test, and there were three directories in that the test directory called A, B, and C, you could just type **cd A** and press enter. You would then be in the c:\test\A.
+
+
+* The **cd ..**  command - this will take you to the next folder up.
+
+
+* The **dir** (Windows) and **ls** (others) command - this will list the files and directories contained in your current directory. If I typed **dir \test** or **ls test** I would see the contents of the c:\test directory.
+Also note for many commands you can use the \* symbol which stands for wildcard. With this in mind, typing **dir *.txt** on WIN or **ls *.txt** on other OS will only list those files that end with .txt.
+
+
+* The **copy** (Windows) or **cp** (others) command - this allows you to copy files from one location to another. To use this command you would type **copy *sourcefile targetfile***. For example if you have the file c:\test\test.txt and would like to copy it to c:\windows\test.txt you would type
+**copy c:\test\test.txt c:\windows\test.txt** and press enter.
+
+
+* The **move** (Windows) or **mv** (others) command - this allows you to move files from one location to another. The syntax you use is the same as for the **copy** command.
+
+
+* The **md** (Windows) or **mkdir** (others) command - this allows you to create a new directory.  For example **md temp** creates a new folder called temp in the current directory.
+
+
+* The **del** (Windows) or **rm** command (others) - this allows you to delete the specified file.  For example, **del test.txt** deletes the test.txt file from the current directory.
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