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Only print usage for the command that was run (at, atq, atrm, batch), not
all four.  Also differentiate between the touch(1) style time as time_arg
and the at(1) style time as timespec (which is what SUS3 does).
Instead of referring to the touch time format as POSIX time, reference
touch.  This is what SUS3 does and it is what users will know.

/*	$OpenBSD: at.h,v 1.6 2002/05/13 16:12:07 millert Exp $	*/
/*	$NetBSD: at.h,v 1.2 1995/03/25 18:13:32 glass Exp $	*/

/*
 *  at.h -  header for at(1)
 *  Copyright (C) 1993  Thomas Koenig
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. The name of the author(s) may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

extern int fcreated;
extern char *__progname;
extern int program;
extern char atfile[];
extern char atverify;

enum { ATQ, ATRM, AT, BATCH, CAT };	/* what are we running as? */

#define AT_MAXJOBS	255	/* max jobs outstanding per user */

#define DEFAULT_BATCH_QUEUE	'E'
#define DEFAULT_AT_QUEUE	'c'