- oct EXPR
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- 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/;
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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;
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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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