From perldoc -f pack: 

    q   A signed quad (64-bit) value.
    Q   An unsigned quad value.
        (Quads are available only if your system supports 64-bit
        integer values _and_ if Perl has been compiled to support thos
+e.
        Causes a fatal error otherwise.)

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In reply to Re: Unpack 64 bit value by almut
in thread Unpack 64 bit value by nagalenoj

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