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Be more verbose about when system immutable flags may be set/cleared.

.\"	$OpenBSD: chflags.1,v 1.9 1999/12/15 16:08:23 aaron Exp $
.\"	$NetBSD: chflags.1,v 1.4 1995/08/31 22:50:22 jtc Exp $
.\"
.\" Copyright (c) 1989, 1990, 1993, 1994
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the Institute of Electrical and Electronics Engineers, Inc.
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.\"	@(#)chflags.1	8.4 (Berkeley) 5/2/95
.\"
.Dd May 2, 1995
.Dt CHFLAGS 1
.Os
.Sh NAME
.Nm chflags
.Nd change file flags
.Sh SYNOPSIS
.Nm chflags
.Oo
.Fl R
.Op Fl H | Fl L | Fl P
.Oc
.Ar flags
.Ar file Op Ar ...
.Sh DESCRIPTION
The
.Nm
utility modifies the file flags of the listed files
as specified by the
.Ar flags
operand.
The
.Ar flags
of a file dictate special restrictions beyond those enforced by its
mode/permissions.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl R
Recursively descend through any specified directory arguments.
Change the flags of the file hierarchies rooted
in the files instead of just the files themselves.
.It Fl H
If the
.Fl R
option is also specified, symbolic links on the command line are followed.
(Symbolic links encountered in the tree traversal are not followed.)
.It Fl L
If the
.Fl R
option is also specified, all symbolic links are followed.
.It Fl P
If the
.Fl R
option is also specified, no symbolic links are followed.
.El
.Pp
Flags are a comma separated list of keywords.
The following keywords are currently defined:
.Bd -literal -offset indent compact
arch	set the archived flag
opaque	set the opaque flag (owner or super-user only)
nodump	set the nodump flag (owner or super-user only)
sappnd	set the system append-only flag (super-user only)
schg	set the system immutable flag (super-user only)
uappnd	set the user append-only flag (owner or super-user only)
uchg	set the user immutable flag (owner or super-user only)
.Ed
.Pp
An immutable file may not be changed, moved, or deleted.
An append-only file is immutable except that data may be appended to it.
.Pp
Putting the letters
.Dq no
before a flag name causes the flag to be turned off.
For example:
.Bd -literal -offset indent compact
nouchg	the immutable bit should be cleared
.Ed
.Pp
The
superuser-settable
.Dq sappnd
and
.Dq schg
flags can be set at any time, but may only be cleared when the system is
running at security level 0 or -1 (insecure or permanently insecure mode,
respectively).
The securelevel is normally set to 0, for example, when
running in single-user mode.
.Pp
Symbolic links do not have flags, so unless the
.Fl H
or
.Fl L
option is set,
.Nm
on a symbolic link always succeeds and has no effect.
The
.Fl H ,
.Fl L
and
.Fl P
options are ignored unless the
.Fl R
option is specified.
In addition, these options override each other and the
command's actions are determined by the last one specified.
.Pp
Only the super-user can change the user flags on block and
character devices.
.Pp
You can use "ls -lo" to see the flags of existing files.
.Pp
The
.Nm
utility exits 0 on success or >0 if an error occurred.
.Sh SEE ALSO
.Xr ls 1 ,
.Xr chflags 2 ,
.Xr stat 2 ,
.Xr fts 3 ,
.Xr symlink 7