Vim - The power of `g`

Some interesting command with g

• ggg?G will root13 whole file :v
• ga display hex, ascii of character under the cursor
• g8 display hex value of utf-8 character.
• G=gg auto (re)indent entire document.

:[range]g[!]/pattern/cmd

• Use ! means do not match pattern
• Cmd list:
  • d: Delete
  • m: Move
  • t: Copy
  • s: Replace

Example:

# Delete all line matching with pattern
:g/pattern/d
# Delete all blank lines
:g/^\s*$/d
# Move all line matching pattern to end of file
:g/pattern/m$
# Add text to end of line matching pattern
:g/^pattern/s/$/mytext
# Run a marco on matching lines
:g/pattern/normal @q

You can find more here