$REAL_GROUP_ID

NAME

defined EXPR defined Returns a Boolean value telling whether EXPR has a value other than the undefined value

NAME

$EVAL_ERROR

Quote and Quote-like Operators While we usually think of quotes as literal values, in Perl they function as operators, providing various kinds

rindex STR,SUBSTR,POSITION rindex STR,SUBSTR Works just like index() except that it returns the position

msgctl ID,CMD,ARG Calls the System V IPC function msgctl(2). You'll probably have to say

NAME

values HASH values ARRAY values EXPR In list context, returns a list consisting