$] - Perldoc Browser

#$PERL_VERSION

#$]

The version + patchlevel / 1000 of the Perl interpreter. This variable can be used to determine whether the Perl interpreter executing a script is in the right range of versions. (Mnemonic: Is this version of perl in the right bracket?) Example:

warn "No checksumming!\n" if $] < 3.019;

See also the documentation of use VERSION and require VERSION for a convenient way to fail if the Perl interpreter is too old.

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