#!/bin/sh
#
# Copyright 1995, by Hewlett-Packard Company
#
# The code in this file is from the book "Shell Programming
# Examples" by Bruce Blinn, published by Prentice Hall.
# This file may be copied free of charge for personal,
# non-commercial use provided that this notice appears in
# all copies of the file.  There is no warranty, either
# expressed or implied, supplied with this code.
#
# NAME
#    addcolumn - add a column of numbers
#
# SYNOPSIS
#    addcolumn [column]
#
# DESCRIPTION
#    This command will read its standard input and add the
#    numbers in the specified column.  If column is omitted,
#    the first column is added.
#
# RETURN VALUE
#    0    Successful completion
#    1    Error condition occurred
#
############################################################
CMDNAME=`basename $0`
if [ $# -gt 1 ]; then
     echo "Usage: $CMDNAME [column]" 1>&2
     exit 1
fi

COLUMN=${1:-1}

expr "$COLUMN" + 1 >/dev/null 2>&1
if [ $? -ge 2 ]; then
     echo "Usage: $CMDNAME argument is not numeric." 1>&2
     exit 1
fi

awk '{total+=$'$COLUMN'} END {print total}'