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Perl in a Nutshell

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Function Reference
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ord expr

Returns the numeric ASCII value of the first character of expr. If expr is omitted, it uses $_. The return value is always unsigned. If you want a signed value, use unpack('c', expr). If you want all the characters of the string converted to a list of numbers, use unpack('C*', expr) instead.

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Reference: opendirBook IndexReference: pack