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Merge arch and machine sources.  Add some options so it will
be easier to get at the ISA (instruction set architecture)

.\" Copyright (c) 1994 SigmaSoft, Th. Lockert
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.\"      This product includes software developed by SigmaSoft, Th. Lockert.
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.\"	$OpenBSD: arch.1,v 1.4 1999/08/19 22:17:38 niklas Exp $
.\"
.Dd June 22, 1996
.Dt ARCH 1
.Os
.Sh NAME
.Nm arch ,
.Nm machine
.Nd print architecture type
.Sh SYNOPSIS
.Nm arch
.Op Fl ks
.Nm machine
.Op Fl a
.Sh DESCRIPTION
The
.Nm
and
.Nm machine
command displays the machine's architecture in slightly different ways.
.Nm
by default displays the application architecture, defined by both the
operating system and the instruction set architecture, while
.Nm machine
displays the kernel architecture (without the operating system part).
Note that both commands output the target architecture as opposed to
.Xr uname 1
which describes the host.  This is useful for dynamic discovery
of the target architecture in build or configuration scripts
needing to work in cross-compilation environments.
.Pp
The following options are available to
.Nm arch :
.Bl -tag -width indent
.It Fl k
Display the kernel architecture instead of application
architecture.
.It Fl s
Display the chosen architecture in a short form, i.e. without the
operating system prefixed.
.El
.Pp
The
.Nm machine
command accepts this option:
.Bl -tag -width indent
.It Fl a
Display the application architecture instead of the kernel architecture.
.El
.Sh SEE ALSO
.Xr uname 1
.Sh HISTORY
The
.Nm
command is
.Ud .