Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Make ``realpath'' behave like ``realpath .''.

Enhance realpath(1) in a number of ways:

- Allow realpath to accept multiple paths on the command line.
- Add -q to suppress warnings if some paths can't be processed, and use
getopt(3) to process flags.
- Print the path being requested rather than a possibly partially
processed path when a failure occurs so that you can tell which of
several passed paths did fail.

MFC after: 1 week
PR: 112920
Submitted by: Ighighi <ighighi@gmail.com>

Add the new standard EXIT STATUS section where appropriate.
Sort standard sections in the (documented) preferred order.

/*- or .\"- or #- to begin license clauses.

Remove clause 3 from the UCB licenses.

OK'ed by: imp, core

Use `The .Nm utility'

Repo-copied `src/bin/pwd/realpath.1' to `src/bin/realpath/realpath.1',
as part of the move to seperate realpath(1) into its own directory.

mdoc(7) police: utilize the new .Ex macro.

mdoc(7) police: removed HISTORY info from the .Os call.

Move the realpath(1) birth day from FreeBSD 5.0 to FreeBSD 4.3.

Submitted by: "Stephen L. Palmer" <slpalmer@mail.com>
Forgotten by: asmodai

mdoc(7) police: minor fixes.

Let the pwd program double as realpath(1).

This lets you resolve pathnames to their underlying physical path:

critter# realpath /sys/kern/subr_disk.c
/freebsd/src/sys/kern/subr_disk.c

Update the pwd man-page slightly.