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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
$FORMAT_PAGE_NUMBER
$^E
$EFFECTIVE_GROUP_ID
$~
${^RE_TRIE_MAXBUF}
$FORMAT_LINE_BREAK_CHARACTERS
$^F
${^TAINT}
${^UTF8LOCALE}
$^S
$ARG
$;
Use of uninitialized value $got in pattern match (m//) at Test/Deep/Regexp.pm line 57.
${^RE_DEBUG_FLAGS}
$PERLDB