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m// The match operator. See Regexp Quote-Like Operators in perlop

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

chroot FILENAME chroot This function works like the system call by the same name: it makes the named directory

join EXPR,LIST Joins the separate strings of LIST into a single string with fields separated by the value of EXPR, and returns that new string

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break Break out of a given() block. This

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