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my @ary = (0..7); print "\$ary[$_] = $ary[$_]\n" for (0..7); { local $[ = 1; print "\$ary[$_] = $ary[$_]\n" for (1..8); }perldoc perlvar
$[ The index of the first element in an array, and of the first character in a substring. Default is 0, but you could theoretically set it to 1 to make Perl behave more like awk (or Fortran) when subscripting and when evaluating the index() and substr() functions. (Mnemonic: [ begins subscripts.) As of release 5 of Perl, assignment to $[ is treated as a compiler directive, and cannot influence the behavior of any other file. (That��s why you can only assign compile��time constants to it.) Its use is highly discouraged. Note that, unlike other compile��time directives (such as strict), assignment to $[ can be seen from outer lexical scopes in the same file. However, you can use local() on it to strictly bind its value to a lexical block.
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