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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
$$, $PROCESS_ID, $PID- The process number of the current script / program / executable.
$EXECUTABLE_NAME
$)
$^H
$PROGRAM_NAME
$INPUT_RECORD_SEPARATOR
Chomp and $/, the Input Record Separator
${^POSTMATCH}
$EFFECTIVE_USER_ID
${^LAST_FH}
${^CHILD_ERROR_NATIVE}
Use of uninitialized value $got in pattern match (m//) at Test/Deep/Regexp.pm line 57.
$SUBSEP
$^E
$ERRNO