Using Vi editor
Vi editor can be in three different modes at a given time.
Command mode: accept commands which are often entered as single letters.
Ex mode: to manipulate files (including savving file and running outside programs. Typing a colon (:) will enter the ex-mode and entering the name of the command. After running the ex-mode, it will automatically return to command mode.
Insert mode: we can enter text in this mode. Presssing Esc key will exit insert mode and returns to command mode. Typing i or a will enter insert mode when in command mode.
Popular Vi commands
When in insert mode
O (letter O) will open a new line immediately below the currnt line.
When in command mode
u will undo any change
o (a lowercase letter O) will open text
~ (tilde) will change case (e.g. a -> A)
/keyword will search forward for text matching keyword.
:q! will end an editing session without saving the modified contents.
:w filename will save the file with the given filename.
l (ell) key and the RIGHT ARROW key will move the cursor forward one character at a time.
h key and the LEFT ARROW key will move the cursor backward one character at a time.
b key will move the cursor backward by a word.
w key will move the cursor forward by a word.
Capitals B and W will jum backward and forward by blank delimited words.
ENTER key will move the cursor to the beginning of the next line.
j and DOWN ARROW key will move the cursor down one line to the character just below the current character.
k and UP ARROW key will move the cursor up one line to the character just above the current character.
x key will delete the current character.
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