vim

Vim (Vi IMproved), a command-line text editor, provides several modes for different kinds of text manipulation. Pressing i in normal mode enters insert mode. Pressing <Esc> goes back to normal mode, which enables the use of Vim commands. See also vimdiff, vimtutor, nvim. More information: https://www.vim.org.

• Open a file:
  vim {{path/to/file}}
• Open a file at a specified line number:
  vim +{{line_number}} {{path/to/file}}
• View Vim's help manual:
  :help<Enter>
• Save and quit the current buffer:
  :wq<Enter>
• Enter normal mode and undo the last operation:
  <ESC>u
• Search for a pattern in the file (press n/N to go to next/previous match):
  /{{search_pattern}}<Enter>
• Perform a regular expression substitution in the whole file:
  :%s/{{regular_expression}}/{{replacement}}/g<Enter>
• Display the line numbers:
  :set nu<Enter>