or download this
$ perl -MTime::HiRes=time -le 'while () { $a=time; print $a, " ", $a-$
+b; $b=$a; sleep 1.01 }'
Use of uninitialized value $b in subtraction (-) at -e line 1.
...
Complete documentation for Perl, including FAQ lists, should be found
+on
this system using "man perl" or "perldoc perl". If you have access to
+ the
Internet, point your browser at http://www.perl.org/, the Perl Home Pa
+ge.