#!/bin/sh

set -e

if [ -z "$1" ]; then
  # default to current working directory:
  dir="."
else
  dir="$1"
fi

# if we got a directory as first param, cd there first:
if [ -e "$dir" ]; then
  if [ -d "$dir" ]; then
    cd "$dir"
  else
    echo "Not a directory: $dir"
    exit 1
  fi
else
  echo "No such path: $dir"
  exit 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"