Frequently Asked Question

What is ex mode and why does Vim have it?

Ex is the line editor Vim is built on top of. vi was originally written by Bill Joy in 1976 as a visual mode for the older ex editor, which was itself a successor to ed. The lineage shows: every command you type after a colon in Vim, :w, :s/foo/bar/, :g/error/d, :5,10 delete, is an ex command, executed by the line-editing layer beneath the visual interface. The colon prompt at the bottom of the screen is the ex command line.

Vim also has a separate mode called Ex mode proper, entered with Q from normal mode (in classic Vim) or by running the editor as ex. It drops the screen-oriented view entirely and gives you a teletype-style prompt where each line is one ex command. This is essentially never useful interactively in 2026, and Neovim disabled Q by default for that reason. You leave with :visual to return to the normal screen editor.

The legacy is worth understanding for two reasons. Scripts that drive Vim non-interactively (vim -e -c 'commands' file) use ex mode under the hood. And the design, a small set of operators and motions composed into a grammar, descends directly from ex's line-range syntax (5,10delete, g/pat/d), which dates back to ed in the early 1970s. Half a century later, the same grammar still works.