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Top Forums UNIX for Dummies Questions & Answers Remove duplicate rows of a file based on a value of a column Post 302240574 by risk_sly on Friday 26th of September 2008 05:18:02 AM
Old 09-26-2008
Remove duplicate rows of a file based on a value of a column

Hi,

I am processing a file and would like to delete duplicate records as indicated by one of its column. e.g.

COL1 COL2 COL3
A 1234 1234
B 3k32 2322
C Xk32 TTT
A NEW XX22
B 3k32 2322


I want the file not to contain duplicate COL1. i.e. the file should only contain the ff:

COL1 COL2 COL3
A 1234 1234
B 3k32 2322
C Xk32 TTT


The records with duplicate COL1 were deleted.

Anybody who has suggestions on how to do this?

Thank you.
 

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NUMBER_FORMAT(3)							 1							  NUMBER_FORMAT(3)

number_format - Format a number with grouped thousands

SYNOPSIS
string number_format (float $number, [int $decimals]) DESCRIPTION
string number_format (float $number, int $decimals, string $dec_point = ".", string $thousands_sep = ",") This function accepts either one, two, or four parameters (not three): If only one parameter is given, $number will be formatted without decimals, but with a comma (",") between every group of thousands. If two parameters are given, $number will be formatted with $decimals decimals with a dot (".") in front, and a comma (",") between every group of thousands. If all four parameters are given, $number will be formatted with $decimals decimals, $dec_point instead of a dot (".") before the decimals and $thousands_sep instead of a comma (",") between every group of thousands. PARAMETERS
o $number - The number being formatted. o $decimals - Sets the number of decimal points. o $dec_point - Sets the separator for the decimal point. o $thousands_sep - Sets the thousands separator. RETURN VALUES
A formatted version of $number. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.4.0 | | | | | | | This function now supports multiple bytes in | | | $dec_point and $thousands_sep. Only the first | | | byte of each separator was used in older ver- | | | sions. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 number_format(3) Example For instance, French notation usually use two decimals, comma (',') as decimal separator, and space (' ') as thousand separator. This is achieved with this line : <?php $number = 1234.56; // english notation (default) $english_format_number = number_format($number); // 1,235 // French notation $nombre_format_francais = number_format($number, 2, ',', ' '); // 1 234,56 $number = 1234.5678; // english notation without thousands separator $english_format_number = number_format($number, 2, '.', ''); // 1234.57 ?> SEE ALSO
money_format(3), sprintf(3), printf(3), sscanf(3). PHP Documentation Group NUMBER_FORMAT(3)
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