Some special symbols in Perl: Z

$-Number of printable lines on the current page, part of the perl format system $! Return Error code or error String Based on the context content $ "list separator $ # default digital output format when printing numbers $ process ID of the perl interpreter $ % current page number of the current output channel $ content $ amp; string Matching the previous format $ (group ID of the current process $) valid group ID of the current process $ * Set 1 to process multiline format. it is now replaced by the/s and/M modifiers. $, delimiter of the current output field $. the current input line number of the last Read File $/the delimiter of the current input record. The default line is the new line $: character setting. Subsequent strings are separated to fill continuous fields. $; delimiter used to simulate multi-dimensional arrays. $? Returns the status of the previous External command $ @ error message returned by the perl interpreter from the eval statement $ [index number of the first element in the array $ \ delimiter of the current output record $] perl interpreter sub-version

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