:
##########################################################################
# Title      :	replace - replace older with newer files
# Author     :	Heiner Steven <heiner.steven@odn.de>
# Date       :	1994-01-25
# Requires   :	
# Category   :	File Utilities
# SCCS-Id.   :	@(#) replace	1.2 03/12/19
##########################################################################
# Description
#
##########################################################################

PN=`basename "$0"`			# Program mname
VER='1.2'

usage () {
    echo >&2 "$PN - replace older files with newer ones, $VER (stv '95)
usage: $PN [-av] file [file ...] targetdir
    -a: (add)     copy files not contained in targetdir
    -v: (verbose) print diagnostics"
    exit 1
}

msg () {
    [ "$Verbose" = no ] && return 0

    for i
    do echo "$PN: $i" >&2
    done
}

fatal () { Verbose=yes; msg "$@"; exit 1; }

# newer (file1, file2)
newer () {
    [ $# -ne 2 ] && return 1
    # If both files have the same date, the first file name
    # given to "ls" will be returned.
    Newest=`ls -t "$2" "$1" | head -1`
    [ -z "$Newest" ] && return 2	# error
    if [ "$Newest" = "$1" ]
    then return 0
    else return 1
    fi
}

Verbose=no				# parameter -v
Add=no					# copy new files (yes/no)
while [ $# -gt 1 ]
do
    case "$1" in
	-a) Add=yes ;;
	-v) Verbose=yes ;;
	-*) usage ;;
	*)  break ;;
    esac
    shift
done

if [ $# -lt 2 ]
then usage
else
    Files=
    while [ $# -gt 1 ]
    do
	if [ -d "$1" ]
	then msg "$1 is no file - ignored"
	else Files="$Files $1"
	fi
	shift
    done

    [ -d "$1" ] || fatal "$1 is no directory"
    TargetDir="$1"
fi

[ -n "$Files" ] || exit 0
n=0
for i in $Files
do
    if [ -f "$i" ]
    then
	Name=`basename "$i"`
	Copy=no
	if [ -f  "$TargetDir/$Name" ]
	then				# File exists in target directory
	    newer "$i" "$TargetDir/$Name" && Copy=yes
	else
	    if [ "$Add" = yes ]
	    then Copy=yes
	    else msg "$Name: not in target directory - ignored"
	    fi
	fi

	[ "$Copy" = yes ] && {
	    cp -p "$i" "$TargetDir/$Name" || continue
	    msg " replacing $TargetDir/$Name"
	    n=`expr $n + 1`
	}
    else
	msg "file $i not found - ignored"
    fi
done
msg "replaced $n file(s)"
exit 0