mkdir -p noaccess/access
touch noaccess/access/delete.me
chmod u-x noaccess/
perl -e 'unlink("/home/tom/scratch/perl/noaccess/access/delete.me") or die("oops $!")'
oops Permission denied at -e line 1.
chmod u+x noaccess/
perl -e 'unlink("/home/tom/scratch/perl/noaccess/access/delete.me") or die("oops $!")'