:
# chtext - change text within multiple files

if [ $# -lt 3 ]
then
    echo >&2 "usage: chtext old new [file  ...]"
    exit 1
fi

Old="$1"
New="$2"
shift; shift

for file
do
    echo >&2 "chtext: change $file: $Old to $New"
    if [ -r "$file" ]
    then
	if sed "s|$Old|$New|g" < "$file" > /tmp/ct$$
	then
	    mv /tmp/ct$$ "$file"
	else
	    echo >&2 "chtext: could not change file: $file"
	fi
    fi
done