====== Create And Edit Text Files ======

**General Information**

Configuration files are everywhere and need a text editor. 

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====== Linux Text Editors ======

  * emacs => older text editor, not always on a system
  * nano => very simple edtior, not always on a system
  * vi/vim => vi always on the system, vim sometimes on a system
    * **For this reason, learn vi/vim.**

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===== vi/vim =====

vi or vim will almost always be installed on a Linux distro, so it is the best to learn.

Create new file "file1"
<code bash>
vi file1
</code>

  * Command Mode => Cannot type into the file, used for movement/editing
  * Insert Mode => Type in this mode
  * Ex Mode => Searching, Saving, Quiting, and Changing Vi's options

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==== Command Mode ====

Movement
  * i => enter Insert Mode
  * h => move left
  * j => move down
  * k => move up
  * l => move right
  * G => goto last line in file
  * 1G => goto first line in file

Editing
  * yy => yank line (copy)
  * p => paste before current line
  * P => paste after current line
  * u => undo last change
  * dd => delete line
  * 5dd => delete 5 lines
  * dw => delete current word
  * cw => delete current word and enter insert mode (change word)
  * cc => delete current line and enter insert mode

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==== Insert Mode ====

  * Esc => leave Insert mode, enter Command Mode

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==== Ex Mode ====

  * :q => quit
  * :w => write changes (save)
  * :wq => write (save) and quit
  * :q! => quit without saving changes
  * :%s/dog/cat => replace first occurance of "dog" on each line with "cat"
  * :%s/dog/cat/g => replace all occurances of "dog" with "cat" (g = global)
  * :! => run shell commands from vi
  * :r oldfile => copy contents of oldfile into current file being edited
  * :e file1.txt => load file1.txt into the editor (only if current file being edited has been saved)

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