Perl can tell you what it means:
    perldoc -v "$@"
(You will have to use single- or double- (or no) quotes around  $@ as appropriate to your operating system and shell; the command line above works for me on Win7.)
See also  $@ and Error Variables in perlvar.

In reply to Re: what does "$@" mean? by AnomalousMonk
in thread what does "$@" mean? by skyworld_chen

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