#!/bin/sh

#################################################
## upper v2.1                                  ##
## convert all text input to UPPERCASE         ##
##                                             ##
## input can come from eithet STDIN or a file  ##
## given as a command line argument            ##
##                                             ##
## Copyright (c) 15 May 2003 Atom Emet         ##
## Atom*Business-PHP.com                       ##
##                                             ##
## This program is free software; you can      ##
## redistribute it and/or modify it under the  ##
## terms of the GNU General Public License as  ##
## published by the Free Software Foundation;  ##
## either version 2 of the License, or         ##   
## (at your option) any later version.         ##
##                                             ##
## This program is distributed in the hope     ##
## that it will be useful, but WITHOUT ANY     ##
## WARRANTY; without even the implied warranty ##
## of MERCHANTABILITY or FITNESS FOR A         ##
## PARTICULAR PURPOSE. See the GNU General     ##
## Public License for more details.            ##
##                                             ##
## You should have received a copy of the      ##
## GNU General Public License along with this  ##
## program; if not, write to                   ##
##    the Free Software Foundation, Inc.       ##
##    59 Temple Place - Suite 330              ##
##    Boston, MA  02111-1307, USA              ##
#################################################

########################################
## allow either zero or one arguments ##
########################################
if [ "${#}" -gt '1' ]
then
	###############################################
	## if more than one argument is given,       ##
	## echo an error message into STANDARD ERROR ##
	## and exit leaving an exit status "1"       ##
	###############################################
	echo 'upper: One file at a time' >&2
	exit 1
fi

#######################################################
## check if an argument is given on the command line ##
#######################################################
if [ "${#}" = '1' ]
then
	########################################################
	## if there's an argument, check that the file exists ##
	########################################################
	if [ -e "${1}" ]
	then
	    ###########################################################
	    ## if the file specified on the command line does exist, ##
	    ## input comes from that file                            ##
	    ###########################################################
	    cat "${1}" | tr '[a-z]' '[A-Z]'
	    exit 0
	else
	    ###############################################################
	    ## if the file specified on the command line does not exist, ##
	    ## echo an error message into STANDARD ERROR                 ##
	    ## and exit leaving an exit status "2"                       ##
	    ###############################################################
	    echo "upper: No such file or directory \"${1}\"" >&2
	    exit 2
	fi
else
	##################################################
	## if no file is specified on the command line, ##
	## then input comes from STANDARD INPUT         ##
	##################################################
	tr '[a-z]' '[A-Z]'
	exit 0
fi