#!/bin/sh

# if we got a directory as first param, cd there first:
if [ -d "$1" ]; then
  cd "$1"
fi

# probably GNU-dependent
# list (A)lmost all files in
# current dir, sorted by (t)ime,
# and return the first (newest):
basename=`ls -At | head -1`

# get full path:
readlink -f "$basename"