Remove duplicate records


 
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# 8  
Old 03-03-2010
Code:
>cut -d";" -f1,2,4 <scottn.txt | sort | uniq -u | gawk 'IFS=OFS=FS=";"{print $1,$2,".*",$3}' >match.txt
>grep -f match.txt <scottn.txt

sort -t\; -k1,1 -k2,2 -k4,4 scottn.txt | sed 's/[^;]*;/*;/3' | uniq -u > match.txt
grep -f match.txt scottn.txt

it is failing for the fields having $ ( ) characters.

Last edited by Scott; 03-03-2010 at 12:52 PM.. Reason: Code tags, please...
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GETMXRR(3)								 1								GETMXRR(3)

getmxrr - Get MX records corresponding to a given Internet host name

SYNOPSIS
bool getmxrr (string $hostname, array &$mxhosts, [array &$weight]) DESCRIPTION
Searches DNS for MX records corresponding to $hostname. PARAMETERS
o $hostname - The Internet host name. o $mxhosts - A list of the MX records found is placed into the array $mxhosts. o $weight - If the $weight array is given, it will be filled with the weight information gathered. RETURN VALUES
Returns TRUE if any records are found; returns FALSE if no records were found or if an error occurred. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.0 | | | | | | | This function is now available on Windows plat- | | | forms. | | | | +--------+---------------------------------------------------+ NOTES
Note This function should not be used for the purposes of address verification. Only the mailexchangers found in DNS are returned, how- ever, according to RFC 2821 when no mail exchangers are listed, $hostname itself should be used as the only mail exchanger with a priority of 0. Note For compatibility with Windows before this was implemented, then try the PEAR class Net_DNS. SEE ALSO
checkdnsrr(3), dns_get_record(3), gethostbyname(3), gethostbynamel(3), gethostbyaddr(3), the named(8) manual page. PHP Documentation Group GETMXRR(3)