ex

Command-line text editor. See also: vim. More information: https://www.vim.org.

• Open a file:
  ex {{path/to/file}}
• Save and Quit:
  wq<Enter>
• Undo the last operation:
  undo<Enter>
• Search for a pattern in the file:
  /{{search_pattern}}<Enter>
• Perform a regular expression substitution in the whole file:
  %s/{{regular_expression}}/{{replacement}}/g<Enter>
• Insert text:
  i<Enter>{{text}}<C-c>
• Switch to Vim:
  visual<Enter>