#!/bin/bash

export _EXISTS=0
export _NONEXISTS=0
export _UNIQUE=0

while true ; do
        case "$1" in
                -e|--exists) export _EXISTS=1; shift ;;
                -n|--nonexists) export _NONEXISTS=1; shift ;;
                -a|--all) export _EXISTS=1; export _NONEXISTS=1; shift ;;
                -u|--unique) export _UNIQUE=1; shift ;;
                *) break;
        esac
done

if [ "$_EXISTS" == "0" -a "$_NONEXISTS" == "0" ] ; then
  export _EXISTS=1
  export _NONEXISTS=1
fi

strace -ff -e trace=file "$@" 2>&1 |
  perl -ne 's/^[^"]+"(([^\\"]|\\[\\"nt])*)".*/$1/ && do { '$_EXISTS' and -e $1 and (not '$_UNIQUE' or not $seen{$_}++) and print; '$_NONEXISTS' and ! -e $1 and (not '$_UNIQUE' or not $seen{$_}++) and print };'