ed

The original Unix text editor. See also: awk, sed. More information: https://www.gnu.org/software/ed/manual/ed_manual.html.

• Start an interactive editor session with an empty document:

ed

• Start an interactive editor session with an empty document and a specific prompt:

ed --prompt='> '

• Start an interactive editor session with user-friendly errors:

ed --verbose

• Start an interactive editor session with an empty document and without diagnostics, byte counts and '!' prompt:

ed --quiet

• Start an interactive editor session without exit status change when command fails:

ed --loose-exit-status

• Edit a specific file (this shows the byte count of the loaded file):

ed {{path/to/file}}

• Replace a string with a specific replacement for all lines:

,s/{{regular_expression}}/{{replacement}}/g