You move files with link()/unlink() or [unless you have a really old version of Perl] rename(). You delete files with unlink(). None of them work across file systems. The first two have been a basic part of Unix for a long time and rename() is a recent addition. Same for Perl [because Perl is based on Unix].

Unix and C don't have a standard subroutine for copying files and so Perl doesn't either [nor for moving a file across file systems which is just a copy and delete]. There are modules for this.

        - tye (but my friends call me "Tye")