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groff_man(7):
History
M. Douglas McIlroy ⟨m.douglas.mcilroy@dartmouth.edu⟩ designed,
implemented, and documented the AT&T man macros for Unix Version 7
(1979) and employed them to edit Volume 1 of its Programmer’s
Manual, a compilation of all man pages supplied by the system. The
package supported the macros listed in this page not described as
extensions, except P and the deprecated AT and UC. It documented
no registers and defined only R and S strings.
UC appeared in 3BSD (1980). Unix System III (1980) introduced P
and exposed the registers IN and LL, which had been internal to
Seventh Edition Unix man. PWB/Unix 2.0 (1980) added the Tm string.
4BSD (1980) added lq and rq strings. SunOS 2.0 (1985) recognized
C, D, P, and X registers. 4.3BSD (1986) added AT and P. Ninth
Edition Unix (1986) introduced EX and EE. SunOS 4.0 (1988) added
SB. Unix System V (1988) incorporated BSD’s lq and rq strings.
Except for EX/EE, James Clark implemented the foregoing features in
early versions of groff. Later, groff 1.20 (2009) resurrected
EX/EE and originated SY/YS, TQ, MT/ME, and UR/UE. Plan 9 from User
Space’s troff introduced MR in 2020.
* xargs/xargs.1: Favor `P` macro, which the page predominantly uses, over
`PP` (`LP` is not observed). `P` has been universally portable since 1986.
Discussed at:
https://lists.gnu.org/r/bug-findutils/2025-11/msg00094.html
Copyright-paperwork-exempt: Yes