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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
$/
Chomp and $/, the Input Record Separator
$FORMAT_FORMFEED
$;
$DEBUGGING
$_ the default variable of Perl
$INPUT_LINE_NUMBER
$(
$^M
$" $LIST_SEPARATOR
$COMPILING
$PERLDB
$FORMAT_PAGE_NUMBER
$OUTPUT_FIELD_SEPARATOR
$<