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• $, the output field separator, and $" the list separator of Perl

• How to extract strings from a file

• Installing and getting started with Perl

• Scalar values and variables - video

• Scalar variables

• $^

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• $a

• Don't use $a and $b outside of sort, not even for examples

• $FORMAT_LINES_PER_PAGE

• $FORMAT_FORMFEED

• $3

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• $.

• $PERL_VERSION

• Methods, Functions and Subroutines in Perl and what is $self ?

• $INPLACE_EDIT

• ${^GLOBAL_PHASE}

• $MATCH

• $EUID