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Top Forums Shell Programming and Scripting Removing duplicate records in a file based on single column explanation Post 302608583 by cokedude on Sunday 18th of March 2012 02:01:33 AM
Old 03-18-2012
Removing duplicate records in a file based on single column explanation

I was reading this thread. It looks like a simpler way to say this is to only keep uniq lines based on field or column 1.

https://www.unix.com/shell-programmin...le-column.html

Can someone explain this command please? How are there no errors from using the same filename twice?

Code:
awk -F"," 'NR == FNR {  cnt[$1] ++} NR != FNR {  if (cnt[$1] == 1) print $0 }' filer.txt filer.txt

 

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DB2_FIELD_WIDTH(3)							 1							DB2_FIELD_WIDTH(3)

db2_field_width - Returns the width of the current value of the indicated column in a result set

SYNOPSIS
int db2_field_width (resource $stmt, mixed $column) DESCRIPTION
Returns the width of the current value of the indicated column in a result set. This is the maximum width of the column for a fixed-length data type, or the actual width of the column for a variable-length data type. PARAMETERS
o $stmt - Specifies a statement resource containing a result set. o $column - Specifies the column in the result set. This can either be an integer representing the 0-indexed position of the column, or a string containing the name of the column. RETURN VALUES
Returns an integer containing the width of the specified character or binary data type column in a result set. If the specified column does not exist in the result set, db2_field_width(3) returns FALSE. SEE ALSO
db2_field_display_size(3), db2_field_name(3), db2_field_num(3), db2_field_precision(3), db2_field_scale(3), db2_field_type(3). PHP Documentation Group DB2_FIELD_WIDTH(3)
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