I have just started using Vim for writing small scripts while doing CTFs so this will have things that I am learning with time.

• duplicate a line: :t.

• Copy paste are simple:

  • Shift+CTRL+C - copy

  • Shift+CTRL+V - paste

• quit

  • :qa!

• visual mode:

  • v to get into visual mode - this is just for characters

  • V - this is for line mode

  • Ctrl+v - Visual block mode

  • Use arrow keys to select the text.

    • Shift+$ - to completely select the word.

  • Y - yank(copy)

  • d - delete

  • p - paste

  • u - undo

• :s/,/\r/g

  • Break on comma

• :set number

  • Show line number

To Select and comment multiple lines

• Select the first caracter of your block

• press Ctrl+V ( this is rectangular visual selection mode)

• type j for each line more you want to be commented

• type Shift-i (like I for "insert at start")

• type // (or # or " or ...)

• You will see the modification appearing only on the first line

• IMPORTANT LAST STEP: type Esc key, and there you see the added character appear on all lines