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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
${^UNICODE}
$OUTPUT_AUTOFLUSH
${^ENCODING}
$-
$3
$^C
$.
Chomp and $/, the Input Record Separator
$^V
$EFFECTIVE_USER_ID
$FORMAT_LINES_PER_PAGE
${^LAST_FH}
${^OPEN}
$GID
$FORMAT_TOP_NAME