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README revision 1.7 
      1  1.4  alm ed is an 8-bit-clean, POSIX-compliant line editor.  It should work with
      2  1.4  alm any regular expression package that conforms to the POSIX interface
      3  1.4  alm standard, such as GNU regex(3).
      4  1.1  cgd 
      5  1.5  alm If reliable signals are supported (e.g., POSIX sigaction(2)), it should
      6  1.7  alm compile with little trouble.  Otherwise, the macros SPL1() and SPL0()
      7  1.5  alm should be redefined to disable interrupts.
      8  1.5  alm 
      9  1.1  cgd The following compiler directives are recognized:
     10  1.1  cgd DES		- use to add encryption support (requires crypt(3))
     11  1.1  cgd NO_REALLOC_NULL	- use if realloc(3) does not accept a NULL pointer
     12  1.4  alm BACKWARDS	- use for backwards compatibility
     13  1.7  alm EX_BANG		- use to support ex-style ! (bang) command.
     14  1.1  cgd 
     15  1.2  alm The file `POSIX' describes extensions to and deviations from the POSIX
     16  1.2  alm standard.
     17  1.1  cgd 
     18  1.1  cgd The ./test directory contains regression tests for ed. The README
     19  1.1  cgd file in that directory explains how to run these.
     20  1.1  cgd 
     21  1.2  alm For a description of the ed algorithm, see Kernighan and Plauger's book
     22  1.1  cgd "Software Tools in Pascal," Addison-Wesley, 1981.
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