$ mkdir -p /tmp/654653
$ cd /tmp/654653
$ mkdir -p FOO/BAR
$ mkdir -p FOO/TZE
$ touch FOO/BAR/BANANA
$ touch FOO/BAR/APPLE
$ touch FOO/TZE/ORANGE
$ perl 654653.pl
mv: cannot stat `//654653.pl': No such file or directory
mv: cannot stat `/BAR/APPLE': No such file or directory
mv: cannot stat `/BAR/BANANA': No such file or directory
mv: cannot stat `/TZE/ORANGE': No such file or directory
mv: cannot stat `/654653/654653.pl': No such file or directory
mv: cannot stat `/654653/FOO/BAR/APPLE': No such file or directory
mv: cannot stat `/654653/FOO/BAR/BANANA': No such file or directory
mv: cannot stat `/654653/FOO/TZE/ORANGE': No such file or directory