[unix-history] / bin / ed / README

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:
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.
Commit	Line	Data
54a7a3ed AM	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:
54a7a3ed AM	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
	14	The file `POSIX' describes extensions to and deviations from the POSIX
	15	standard.
	16
	17	The ./test directory contains regression tests for ed. The README
	18	file in that directory explains how to run these.
	19
	20	For a description of the ed algorithm, see Kernighan and Plauger's book
	21	"Software Tools in Pascal," Addison-Wesley, 1981.