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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

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

$OUTPUT_RECORD_SEPARATOR

$^V

$~

$INPLACE_EDIT

${^OPEN}

$LAST_REGEXP_CODE_RESULT

$EFFECTIVE_GROUP_ID

$^O $OSNAME

$$

$[

${^RE_TRIE_MAXBUF}

$RS

Chomp and $/, the Input Record Separator

$^F