Hmmm, let's not, shall we? At least, not if you care about your permission bits.
$ touch /tmp/foo
$ chmod -w+x /tmp/foo
$ ls -l /tmp/foo
$ -r-x------ 1 javafan staff 0 Aug 7 18:16 /tmp/foo
$ perl -MFile::Copy -wE 'move "/tmp/foo", "/var/tmp/foo"'
$ ls -l /var/tmp/foo
$ -rw------- 1 javafan staff 0 Aug 7 18:16 /var/tmp/foo
But with mv:
$ touch /tmp/foo
$ chmod -w+x /tmp/foo
$ ls -l /tmp/foo
$ -r-x------ 1 javafan staff 0 Aug 7 18:18 /tmp/foo
$ mv /tmp/foo /var/tmp/foo
$ ls -l /var/tmp/foo
$ -r-x------ 1 javafan staff 0 Aug 7 18:18 /var/tmp/foo
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