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Top Forums Shell Programming and Scripting UNIX scripting for finding duplicates and null records in pk columns Post 302901038 by Don Cragun on Sunday 11th of May 2014 03:14:45 AM
Old 05-11-2014
Hi praveenraj.1991,
Yoda's script may work fine for you, but your requirements are a little vague.

Can 0 be a key? If so, can 00 be a key? If so, are 0 and 00 distinct keys? (If the answer to any of these is yes, Yoda's script won't work for you.)

If you have lines:
Code:
11|55|ram|mgr
55|11|abc|def
11|10|efg|hij
33|10|sam|am

what should be the output? Or, more explicitly, does the order matter: are 11|55 and 55|11 duplicates keys? And, does each pair of keys have to be unique, or does each individual key have to be unique: are 55|11 and 11|30 duplicates because 11 is a common key? (If the answer to any of these is yes, Yoda's script won't work for you.)
 

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COLUMN(1)						    BSD General Commands Manual 						 COLUMN(1)

NAME
column -- columnate lists SYNOPSIS
column [-entx] [-c columns] [-s sep] [file ...] DESCRIPTION
The column utility formats its input into multiple columns. Rows are filled before columns. Input is taken from file operands, or, by default, from the standard input. Empty lines are ignored unless the -e option is used. The options are as follows: -c Output is formatted for a display columns wide. -s Specify a set of characters to be used to delimit columns for the -t option. -t Determine the number of columns the input contains and create a table. Columns are delimited with whitespace, by default, or with the characters supplied using the -s option. Useful for pretty-printing displays. -x Fill columns before filling rows. -n By default, the column command will merge multiple adjacent delimiters into a single delimiter when using the -t option; this option disables that behavior. This option is a Debian GNU/Linux extension. -e Do not ignore empty lines. ENVIRONMENT
The COLUMNS, LANG, LC_ALL and LC_CTYPE environment variables affect the execution of column as described in environ(7). EXIT STATUS
The column utility exits 0 on success, and >0 if an error occurs. EXAMPLES
(printf "PERM LINKS OWNER GROUP SIZE MONTH DAY " ; printf "HH:MM/YEAR NAME " ; ls -l | sed 1d) | column -t SEE ALSO
colrm(1), ls(1), paste(1), sort(1) HISTORY
The column command appeared in 4.3BSD-Reno. BUGS
Input lines are limited to LINE_MAX (2048) bytes in length. BSD
July 29, 2004 BSD
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