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      1 $NetBSD: README,v 1.10 2019/01/04 19:13:58 maya Exp $
      2 
      3 ed is an 8-bit-clean, POSIX-compliant line editor.  It should work with
      4 any regular expression package that conforms to the POSIX interface
      5 standard, such as GNU regex(3).
      6 
      7 If reliable signals are supported (e.g., POSIX sigaction(2)), it should
      8 compile with little trouble.  Otherwise, the macros SPL1() and SPL0()
      9 should be redefined to disable interrupts.
     10 
     11 The following compiler directives are recognized:
     12 DES		- to add encryption support (requires crypt(3))
     13 BACKWARDS	- for backwards compatibility
     14 NEED_INSQUE	- if insque(3) is missing
     15 
     16 The file `POSIX' describes extensions to and deviations from the POSIX
     17 standard.
     18 
     19 The ./test directory contains regression tests for ed. The README
     20 file in that directory explains how to run these.
     21 
     22 For a description of the ed algorithm, see Kernighan and Plauger's book
     23 "Software Tools in Pascal," Addison-Wesley, 1981.
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