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$ 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.

$ perl -V
Summary of my perl5 (revision 5 version 26 subversion 3) configuration
+:
...
    /usr/share/perl5/vendor_perl/5.26
    /usr/lib/perl5/5.26/x86_64-cygwin-threads
    /usr/share/perl5/5.26