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# oct

Perl 5 version 10.1 documentation
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# oct

Perl functions A-Z | Perl functions by category | The 'perlfunc' manpage

- oct EXPR

- oct

  Interprets EXPR as an octal string and returns the corresponding value. (If EXPR happens to start off with `0x` , interprets it as a hex string. If EXPR starts off with `0b`, it is interpreted as a binary string. Leading whitespace is ignored in all three cases.) The following will handle decimal, binary, octal, and hex in the standard Perl or C notation:

          $val = oct($val) if $val =~ /^0/;

  If EXPR is omitted, uses `$_` . To go the other way (produce a number in octal), use sprintf() or printf():

          $perms = (stat("filename"))[2] & 07777;    $oct_perms = sprintf "%lo", $perms;

  The oct() function is commonly used when a string such as `644` needs to be converted into a file mode, for example. (Although perl will automatically convert strings into numbers as needed, this automatic conversion assumes base 10.)

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