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README revision 1.3 
      1 ed is a POSIX-compliant line editor.  It should work with any regular
      2 expression package that conforms to the POSIX interface standard, such as
      3 GNU regex(3).
      4 
      5 The following compiler directives are recognized:
      6 GNU_REGEX	- use with GNU regex(3)
      7 DES		- use to add encryption support (requires crypt(3))
      8 NO_REALLOC_NULL	- use if realloc(3) does not accept a NULL pointer
      9 HAVE_SIGSETJMP	- use if sigsetjmp/siglongjmp are supported
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     11 The file `POSIX' describes extensions to and deviations from the POSIX
     12 standard.
     13 
     14 The ./test directory contains regression tests for ed. The README
     15 file in that directory explains how to run these.
     16 
     17 For a description of the ed algorithm, see Kernighan and Plauger's book
     18 "Software Tools in Pascal," Addison-Wesley, 1981.
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