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Interprets ostring as an octal string and returns the equivalent decimal value. (If ostring happens to start off with 0x , it is interpreted as a hex string instead.) The following will handle decimal, octal, and hex in the standard notation:

$val = oct $val if $val =~ /^0/;
If ostring is omitted, the function interprets $_ . To perform the inverse function on octal numbers, use:
$oct_string = sprintf "%lo", $number;