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.

vim path/to/file

vim +line_number path/to/file

:help<Enter>

:wq<Enter>

<Esc>u

/search_pattern<Enter>

:%s/regular_expression/replacement/g<Enter>

:set nu<Enter>