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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
$^W
$|
$ERRNO
Chomp and $/, the Input Record Separator
${^ENCODING}
Use of uninitialized value $got in pattern match (m//) at Test/Deep/Regexp.pm line 57.
$SYSTEM_FD_MAX
$^P
$PERL_VERSION
$MATCH
$CHILD_ERROR
$EXCEPTIONS_BEING_CAUGHT
$SUBSEP
$$, $PROCESS_ID, $PID- The process number of the current script / program / executable.
$POSTMATCH