CVS log for src/usr.bin/env/env.1

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Pull up following revision(s) (requested by kim in ticket #993):

	usr.bin/env/env.1: revision 1.16
	usr.bin/env/env.c: revision 1.24

Implement "env -C dir" to chdir

Use err(3) to expose errno(2) if chdir(2) (or unsetenv(3)) fails.

Implement "env -C dir" to chdir

Use err(3) to expose errno(2) if chdir(2) (or unsetenv(3)) fails.

Merge changes from current as of 20200406

Fix a typo (extra `s')

Implement env(1) -u

The option '-u name' causes removal of the name environment variable if
it is in the environment.  This is similar to the unset command in sh(1).
The value for name must not include the '=' character.

Add HISTORY section in the man page.

The -u argument is implemented by Linux, FreeBSD and Darwin.
The lack of -u in NetBSD is a cause for a frequent fallout in the LLVM
toolchain test-suite.

Improve description of EXIT CODES. Based on the following OpenBSD commit,
forwarded by jmc@openbsd:

Implement env(1) -0

-0      End each output line with NUL, not newline.

FreeBSD and GNU env(1) implement -0 which is used in 3rd party scripts.

This change is based on the FreeBSD code.
rewrite DIAGNOSTICS to avoid confusion about which application returns
what, and when;

started by Jeffrey 'jf' Lim, with some correction from Ingo Schwarze;
ok otto

Implement env(1) -0

-0      End each output line with NUL, not newline.

FreeBSD and GNU env(1) implement -0 which is used in 3rd party scripts.

This change is based on the FreeBSD code.
rewrite DIAGNOSTICS to avoid confusion about which application returns
what, and when;

started by Jeffrey 'jf' Lim, with some correction from Ingo Schwarze;
ok otto

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22365, verified by myself.

New sentence, new line.

Punctuation nit.

Whitespace cleanup.

For commands and utilities, use EXIT STATUS rather than RETURN VALUES or
DIAGNOSTICS as appropriate (and documented in mdoc(7)).

WARNSify, fix .Nm usage

RCS ID police

environmental -> environment

Fix spelling errors.

Document the fact that env is POSIX.2 compliant.
Change "command" to "utility", as env can only execute stand-alone utilitys
as apposed to built-in commands.

Add RCS indentifiers.

Make Posix 1003.2 (Draft 11.2) compliant.