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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
${^RE_TRIE_MAXBUF}
$ACCUMULATOR
Chomp and $/, the Input Record Separator
$INPUT_RECORD_SEPARATOR
$BASETIME
$LAST_REGEXP_CODE_RESULT
Use of uninitialized value $got in pattern match (m//) at Test/Deep/Regexp.pm line 57.
$[
$1
${^POSTMATCH}
DWIM Perl for Linux; $^X vs $Config{perlpath}; Relocatable Perl; Test::Differences
$UID
$~
$EXTENDED_OS_ERROR
$" $LIST_SEPARATOR