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document the actual problems that pkg_check-version can diagnose

.\"	$OpenBSD: pkg_check-version.1,v 1.3 2022/04/19 15:03:12 espie Exp $
.\"
.\" Copyright (c) 2021 Marc Espie <espie@openbsd.org>
.\"
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.Dd $Mdocdate: April 19 2022 $
.Dt PKG_CHECK-VERSION 1
.Os
.Sh NAME
.Nm pkg_check-version
.Nd verify parsing and ordering of package names
.Sh SYNOPSIS
.Nm
.Op Fl Hv
.Ar pkgname ...
.Sh DESCRIPTION
.Nm
takes a list of
.Ar pkgname
and processes them.
.Bl -bullet -compact
.It
each name is parsed and checked for issues.
.It
in addition, comparable names (same stem and same flavor) are sorted
from older to newer version.
.El
.Pp
Options are as follows:
.Bl -tag -width Hv
.It Fl H
displays a human-readable version of each
.Ar pkgname
(full version parsing, including known suffixes, dewey numbers parsing,
REVISION, EPOCH, flavor markers).
.It Fl v
verbose mode, which will explicitly state
.Ar pkgname
with no issues and sort one element lists.
.El
.Sh EXIT STATUS
The
.Nm
utility exits with 0, unless one of the
.Ar pkgname
was malformed, or two names are actually non comparable
.Po
such as
.Sq moo-1.23pre1
and
.Sq moo-1.23rc1
.Pc .
.Sh SEE ALSO
.Xr packages-specs 7
.Sh AUTHORS
.An Marc Espie Aq Mt espie@openbsd.org