• -t: open file in truncation mode
• -R: open a file in read-only mode.
• -W break/scroll: wrap the lines by line breaks / scrolling

• :w: Save the file.
• :q: Quit. Warn user if the file is changed but unsaved.
• :q!: Force quit (i.e. Do not save the file and force quit.).
• :wq: Save then quit.

• dd delete the entire line that the cursor is currently on.
• 0 Move the cursor to the beginning of the line.
• $ Move the cursor to the end of the line.
• w Move forward one word (delimited by a white space or a new line).
• b Move backward one word (delimited by a white space or a new line).

Not yet ready.

• See tab as 4 white spaces

• Adjust the screen resizing and scrolling