From the command line you can use perldoc -v '$"' (doesn't work on older Perls), and all the other special variables are documented in perlvar. Also very helpful is perldoc -f functionname, which will even point you in the right direction if you ask it e.g. perldoc -f for

In reply to Re^3: Scope of separator variable by Anonymous Monk
in thread Scope of separator variable by shadowSage

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