DEST_DIR=/usr/share
GREP=grep

file_exists_exact1()
{
       [ -n "$1" ] || err 3 "USAGE: file_exists_exact path"
       _path="${1#.}"
       [ -h "${DEST_DIR}${_path}" ] || \
               [ -e "${DEST_DIR}${_path}" ] || return 1
       while [ "${_path}" != "/" ] ; do
               _dirname="$(dirname "${_path}" 2>/dev/null)"
               _basename="$(basename "${_path}" 2>/dev/null)"

               ls -fa "${DEST_DIR}${_dirname}" 2> /dev/null \
                       | ${GREP} -F -x "${_basename}" >/dev/null \
                       || return 1

               _path="${_dirname}"
       done
       return 0
}

file_exists_exact2()
{
       [ -n "$1" ] || err 3 "USAGE: file_exists_exact path"
       _path="${1#.}"
       [ -h "${DEST_DIR}${_path}" ] || \
               [ -e "${DEST_DIR}${_path}" ] || return 1
       while [ "${_path}" != "/" ] ; do
               _dirname=${_path%/*}
               _basename=${_path##*/}
               test -n "$_dirname" || _dirname=/

               (
                       cd "${DEST_DIR}${_dirname}"
                       for _entry in .* *; do
                               case ${_entry} in
                               "${_basename}") return 0;;
                               esac
                       done
                       return 1
               ) || return 1

               _path="${_dirname}"
       done
       return 0
}

DEST_DIR="$2"
if file_exists_exact$1 "$3" ; then
       echo "$3" exists in "$2"
fi

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