Given an installed Ubuntu file, what Ubuntu package does the file belong to?

file2pkg.sh

MYSELF=`basename $0`
ARG=$1
ARGC=$#

if [ $ARGC -lt 1 ] || [ -z $ARG  ]; then
	echo
	echo -e "\tUsage:\t"$MYSELF"\t{Installed File(s)}"
	echo
	exit 86
fi

for ARG in $*; do
	dpkg -S "$(readlink -fn "$(which $ARG)")"
done
exit 0

####################################################
# Example:
#     file2pkg.sh ls
# Standard output:
#     coreutils: /bin/ls
# For this example, 
#     coreutils is the derived package name.
#     /bin/ls is the full path of the argument file.
####################################################