Fortunately, some of these seem to be the same as Perl.
E.g.
$_ aka $LAST_READ_LINE
http://blog.dcxn.com/2012/09/16/cryptic-dollar-variables-and-their-meanings/
Fortunately, some of these seem to be the same as Perl.
E.g.
$_ aka $LAST_READ_LINE
http://blog.dcxn.com/2012/09/16/cryptic-dollar-variables-and-their-meanings/