VIM Editor
Edit existing file
Step 1 type vim filename (edit the existing file named filename)
Step 2 move around the file using h/j/k/l key or any appropriate command
h Moves the cursor one character to the left
l Moves the cursor one character to the right
k Moves the cursor up one line
j Moves the cursor down one line
nG or :n Cursor goes to the specified (n) line
(ex. 10G goes to line 10)
Step 3 edit required text (replace or delete or insert)
Step 4 hit Esc key (exit from insert mode if you insert or replace text)
Step 5 type :wq