POSIX ed version 0.6 by Andrew Moore (alm@netcom.com).

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+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 following compiler directives are recognized:
+GNU_REGEX	- use with GNU regex(3)
+DES		- use to add encryption support (requires crypt(3))
+NO_REALLOC_NULL	- use if realloc(3) does not accept a NULL pointer
+BACKWARDS	- use for backwards compatibility
+
+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.