Saturday, March 31, 2012
When working with text editors, you pretty much choose between Vi or Nano. Vi is old school with a blank layout and no visible controls, which can make it difficult to work with for beginners. However, it is very powerful and once you learn the keystrokes it can be used very quickly to edit config files and used for scripts, etc. Nano has a pseudo-graphical layout that makes it a little easier to jump right into. Both are viable options. Vi is a standard whereas Nano has to be available depending on the Linux OS you use. We will look at both and go over the important commands for both.
Let’s look at the difference.
To start Vi, you just have to type “vi” and then the name of the file, or type any name and the file will be created anew.
Example: “vi newfile”
Vi will automatically open in Command mode. On the bottom you will see some info such as the name of the document & info on whether it is a new file or an existing one. Let’s look at an existing file.
Quitting & Saving
There are three modes to Vi: Command mode, Text mode & Ex Mode. If you tried to start typing in command mode you wouldn’t be able to. You need to hit the “I” in order to get into text mode. You can then get back to command mode by the ESC key. Typng “:” will put you into Ex mode.
In order to quit Vi, you have to hit the Esc key and then enter in “:” along with “q” for quit.
If you get stuck in a file that is Read-Only and you can’t quit, you can enter “:q!” with the exlamation point to force quit. If you want to save changes, hit the Esc key along with “:w”.
- :w – Saves
- :wq or
– Save & Quit - :q – Quit
- :q! – Force quit, no save
Navigation in Vi
Navigating in Vi is a little more tricky, and this is what gives new users headaches. You just want to keep your fingers on your keyboard as if you are constantly typing (i.e. h, j, k, l). These keys are the substitute for the arrow keys.- j – down
- k – up
- l – right
- h – left
- gg – Takes you to the beginning of the file
- G(shift + g) – Will take you to the end of the file
- xxG – Brings you to a specific line in the file(xx is the line number)
- ( – Move up to the beginning of the sentence
- ) – Move to the end of the sentence
Insterting Text
- i – Insert before cursor position
- a – append after cursor position
- r – Replace letter
- o – Open line below cursor position automatically goes into insert mode
- O – Open line above cursor in insert mode
Deleting Text
- x – Deletes the character under cursor position
- X – Deletes the character before cursor
- dw – Deletes the word after cursor
- db – Deletes word before the cursor
- u – Will undo changes
Copy(yank) & Paste
- yw – Yanks the word after the cursor
- yb – Yanks the word before the cursor
- yy – Yanks the entire line
- p – Will paste
- P – Will paste before the cursor position
Search
- / – Is used to search(:/searchword)
Setting up Vi with numbers
It might benefit some to view the documents with numbers. What you want to do is go into Exec mode(ESC) and then type in “: set number”. Let’s look at the group file:
Nano
Let’s take a look at workinig with Nano. You start out the same way as you do with Vi by just typing “nano newfile”.
The look is a lot different.
