See the  % template field prefix of unpack (search for '%' or 'prefix'): 
>perl -wMstrict -le
"my $str = '/etc/test2.sh';
 $str .= qq{\0\0\0};
 print unpack '%32N*', $str;
"
990644297

[download]
(See pack for full documentation of template field specifiers, e.g., 'N', 'n', 'V', 'v', etc.)

Updates:

In reply to Re: CRC of a string by AnomalousMonk
in thread CRC of a string by Dirk80

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