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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
$EFFECTIVE_GROUP_ID
$OUTPUT_AUTOFLUSH
$:
Use of uninitialized value $got in pattern match (m//) at Test/Deep/Regexp.pm line 57.
$OUTPUT_FIELD_SEPARATOR
$;
$_
$PREMATCH
$^R
$=
$^A
$ERRNO
$WARNING
$EXTENDED_OS_ERROR
$FORMAT_NAME