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Shell Programming and Scripting
Selecting lines having same values for first two columns
Post 302748871 by pamu on Thursday 27th of December 2012 04:17:58 AM
12-27-2012
Quote:
Thanks for replying so quickly and providing me the desired solution.
I tried the solution provided by RudiC and Sathyaonunix. Both are providing me the solutions. I am looking into the script by Pamu ( I am finding it difficult to understand as my expertise in Unix is not good, so kindly give me some time.)
As regarding query raised by RudiC
(i) if the third column entries are identical, then only one row is to be retained in the original file.
(ii) values cannot be negative.
(iii) the lines without duplicate values to be retained in the orginal file as such.
Thank you once again.
Manoj
I tried the solution provided by RudiC and Sathyaonunix. Both are providing me the solutions. I am looking into the script by Pamu ( I am finding it difficult to understand as my expertise in Unix is not good, so kindly give me some time.)
As regarding query raised by RudiC
(i) if the third column entries are identical, then only one row is to be retained in the original file.
(ii) values cannot be negative.
(iii) the lines without duplicate values to be retained in the orginal file as such.
Thank you once again.
Manoj
As per your current requirement I've modified script lit bit.
Now please check.
Code:
awk 'NR==FNR{A[$1,$2]++; B[$1,$2]=B[$1,$2]?B[$1,$2]<$3?$3:B[$1,$2]:$3;next}
{if(A[$1,$2]>1){if(B[$1,$2]==$3){B[$1,$2]=0;print }else{print > "another_file"}}else{print }}' file fileB[$1,$2]=B[$1,$2]?B[$1,$2]<$3?$3:B[$1,$2]:$3 # Here we compare is $3 is greater than previous $3 for $1 and $2 and retain max value and assign it to B[$1,$2]
I hope this helps
pamu
This User Gave Thanks to pamu For This Post:
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LEARN ABOUT REDHAT
column
COLUMN(1) BSD General Commands Manual COLUMN(1) NAME
column -- columnate lists SYNOPSIS
column [-tx] [-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. 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. Column exits 0 on success, >0 if an error occurred. ENVIRONMENT
COLUMNS The environment variable COLUMNS is used to determine the size of the screen if no other information is available. EXAMPLES
(printf "PERM LINKS OWNER GROUP SIZE MONTH DAY 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. BSD
June 6, 1993 BSD