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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
${^TAINT}
$OUTPUT_AUTOFLUSH
$SUBSEP
$^P
Regex capturing variables $1, $2, $3, $4, $5, $6, ...
$!
$LAST_REGEXP_CODE_RESULT
$^F
$^A
${^WIN32_SLOPPY_STAT}
Use of uninitialized value $got in pattern match (m//) at Test/Deep/Regexp.pm line 57.
$[
$MATCH
$FORMAT_PAGE_NUMBER
$REAL_GROUP_ID