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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
$^E
$>
$]
$BASETIME
$^O $OSNAME
$EGID
$_ the default variable of Perl
$PERLDB
$$, $PROCESS_ID, $PID- The process number of the current script / program / executable.
${^UTF8LOCALE}
$UID
$~
$OUTPUT_RECORD_SEPARATOR
$4
${^CHILD_ERROR_NATIVE}