tldr/pages/common/ed.md

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# ed
> The original Unix text editor.
- Start ed, editing an empty document (which can be saved as a new file in the current directory):
`ed`
- Start ed, editing an empty document, with `:` as a command prompt indicator:
`ed -p :`
- Start ed editing an existing file (this shows the byte count of the loaded file):
`ed -p : {{path/to/file}}`
- Toggle the printing of error explanations. (By default, explanations are not printed and only a `?` appears):
`H`
- Add text to the current document. Mark completion by entering a period by itself in a new line:
`a<Enter>{{text_to_insert}}<Enter>.`
- Print the entire document (`,` is a shortcut to the range `1,$` which covers the start to the end of the document):
`,p`
- Write the current document to a new file (the filename can be omitted if `ed` was called with an existing file):
`w {{filename.txt}}`
- Quit ed:
`q`