03-22-2012
remove duplicates based on a field and criteria
Hi,
I have a file with fields like below:
A;XYZ;102345;222
B;XYZ;123243;333
C;ABC;234234;444
D;MNO;103345;222
E;DEF;124243;333
desired output:
C;ABC;234234;444
D;MNO;103345;222
E;DEF;124243;333
ie, if the 4rth field is a duplicate.. i need only those records where the 3rd field value is greater .. or infact, more specificcally.. need those where the 2nd and 3rd digits of the 3rd field are greater.. Can we do this with awk?
Pls help in finding a solution where i can quickly process a file of around 50000 records
Thanks a lot in advance
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YAZ_SORT(3) 1 YAZ_SORT(3)
yaz_sort - Sets sorting criteria
SYNOPSIS
void yaz_sort (resource $id, string $criteria)
DESCRIPTION
This function sets sorting criteria and enables Z39.50 Sort.
Call this function beforeyaz_search(3). Using this function alone does not have any effect. When used in conjunction with yaz_search(3), a
Z39.50 Sort will be sent after a search response has been received and before any records are retrieved with Z39.50 Present
(yaz_present(3).
PARAMETERS
o $id
- The connection resource returned by yaz_connect(3).
o $criteria
- A string that takes the form field1 flags1 field2 flags2 where field1 specifies the primary attributes for sort, field2 seconds,
etc.. The field specifies either a numerical attribute combinations consisting of type=value pairs separated by comma (e.g.
1=4,2=1) ; or the field may specify a plain string criteria (e.g. title. The flags is a sequence of the following characters
which may not be separated by any white space.
Sort Flags
o a - Sort ascending
o d - Sort descending
o i - Case insensitive sorting
o s - Case sensitive sorting
RETURN VALUES
No value is returned.
EXAMPLES
Example #1
Sort Criterias
To sort on Bib1 attribute title, case insensitive, and ascending you would use the following sort criteria:
1=4 ia
If the secondary sorting criteria should be author, case sensitive and ascending you would use:
1=4 ia 1=1003 sa
PHP Documentation Group YAZ_SORT(3)