System Variables

There are many built-in variables which control the behavior of perl; each of the variables has a terse name, as well as one or more mnemonic ones. To access the long names in Table 2.1, include the line ``use English;'' in your program.

Table 2.1: Some Common System Variables

Name	Long Name	Name	Long Name
$/	$INPUT_RECORD_SEPARATOR	$\	$OUTPUT_RECORD_SEPARATOR
$,	$OUTPUT_FIELD_SEPARATOR	$.	$INPUT_LINE_NUMBER
$<	$UID	$>	$EUID
$$	$PROCESS_ID	$&	$MATCH
$!	$OS_ERROR	$?	$CHILD_ERROR
$|	$OUTPUT_AUTOFLUSH	$^T	$BASETIME
$ARGV	name of file being read	@ARGV	array of command line args