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README revision 1.7 
      1 ed is an 8-bit-clean, POSIX-compliant line editor.  It should work with
      2 any regular expression package that conforms to the POSIX interface
      3 standard, such as GNU regex(3).
      4 
      5 If reliable signals are supported (e.g., POSIX sigaction(2)), it should
      6 compile with little trouble.  Otherwise, the macros SPL1() and SPL0()
      7 should be redefined to disable interrupts.
      8 
      9 The following compiler directives are recognized:
     10 DES		- use to add encryption support (requires crypt(3))
     11 NO_REALLOC_NULL	- use if realloc(3) does not accept a NULL pointer
     12 BACKWARDS	- use for backwards compatibility
     13 EX_BANG		- use to support ex-style ! (bang) command.
     14 
     15 The file `POSIX' describes extensions to and deviations from the POSIX
     16 standard.
     17 
     18 The ./test directory contains regression tests for ed. The README
     19 file in that directory explains how to run these.
     20 
     21 For a description of the ed algorithm, see Kernighan and Plauger's book
     22 "Software Tools in Pascal," Addison-Wesley, 1981.
     23