# emacs

* Prior to starting this demonstration, you should set up your unix directory according to the instructions in [Unix utilities](http://rous.mit.edu/index.php/Unix_utilities)
* [emacs](http://en.wikipedia.org/wiki/GNU_Emacs) is a powerful text editor with extensive functionality.

\
1\) Control mode is activated by pressing and holding the \<ctrl> key while pressing the second key. This process is written as:

C-key

This example shows the result after C-s (search):

[![Ctrls.jpg](http://rous.mit.edu/images/1/1e/Ctrls.jpg)](http://rous.mit.edu/index.php/File:Ctrls.jpg)

2\) Meta-mode is activated by pressing and releasing the \<ESC> key followed by some other key that activates a sub-menu of commands. This process is written as:

ESC option

This example is what appears after entering ESC x (activate execute-extended-command menu)

[![Meta.jpg](http://rous.mit.edu/images/6/62/Meta.jpg)](http://rous.mit.edu/index.php/File:Meta.jpg)

***

* check to see that you are in the IAP\_2010 directory unix by entering the command:

```
pwd
```

* the result should be (where USERNAME is your own unix username)

/home/USERNAME/IAP\_2010/unix

* If it is not, you can change to that directory by executing:

```
cd /home/USERNAME/IAP_2010/unix
```

* create a copy of the file replace.txt with:

```
cp replace.txt replace2.txt
```

* Begin editing replace2.txt with:

```
emacs replace2.txt
```

* Note, on new accounts a splash screen welcomes you to emacs use C-l to exit the screen and proceed to editing.
* Insert text by regular typing.
* Delete letters with C-d
* Delete lines with C-k
* Find and replace text with ESC x , then type replace-string on M-x line. enter search string, then return, then replacement text.
* Move to the end of the document with ESC >
* Move back to the start of the document with ESC <
* Play tetris with ESC x, tetris
* Save and exit with C-x followed by C-c then answer prompts if changes were made.
* To turn off the splash welcome screen, edit a file called .emacs to have the contents:

```
(setq inhibit-splash-screen t)
```


---

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