$OpenBSD: README,v 1.5 2018/06/15 08:46:24 martijn Exp $

$NetBSD: README,v 1.9 1995/03/21 09:04:33 cgd Exp $

ed is an 8-bit-clean, POSIX-compliant line editor. It should work with

any regular expression package that conforms to the POSIX interface

standard, such as GNU regex(3).

If reliable signals are supported (e.g., POSIX sigaction(2)), it should

compile with little trouble. Otherwise, the macros SPL1() and SPL0()

should be redefined to disable interrupts.

The file `POSIX' describes extensions to and deviations from the POSIX

standard.

The ./test directory contains regression tests for ed. The README

file in that directory explains how to run these.

For a description of the ed algorithm, see Kernighan and Plauger's book

"Software Tools in Pascal," Addison-Wesley, 1981.