Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: awk - mixed for and if to select particular lines in a data file
Top Forums Shell Programming and Scripting awk - mixed for and if to select particular lines in a data file Post 302829657 by Don Cragun on Friday 5th of July 2013 01:00:27 PM
Old 07-05-2013
The following produces the output you requested but the order of the output is unspecified:
Code:
awk '
NF < 2 {next
}
!($1 in m) || m[$1] > $2 {
        m[$1] = $2
        o[$1] = $0
}
END {   for(i in o) print o[i]
}' input.txt

If you are using a Solaris system, use /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk instead of /usr/bin/awk or /bin/awk.

Your sample has all of the input with a given 1st column value grouped together, but your statement of requirements didn't say anything about this. The code above accepts input in any order.

If your input always has all lines with the same 1st column value on adjacent input lines, this script can be rewritten to produce output when the 1st column value changes. This would take fewer resources for large input files and would produce output in the same order as the input.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Script needed to select and delete lower case and mixed case records

HELLO ALL, URGENTLY NEEDED A SCRIPT TO SELECT AND DELETE LOWER AND MIXED CASE RECORDS FROM A COLUMN IN A TABLE. FOR EXAMPLE : Table name is EMPLOYEE and the column name is CITY and the CITY column records will be: Newyork washington ... (1 Reply)
Discussion started by: abhilash mn
1 Replies

2. Shell Programming and Scripting

Select some lines from a txt file and create a new file with awk

Hi there, I have a text file with several colums separated by "|;#" I need to search the file extracting all columns starting with the value of "1" or "2" saving in a separate file just the first 7 columns of each row maching the criteria, with replacement of the saparators in the nearly created... (4 Replies)
Discussion started by: capnino
4 Replies

3. Shell Programming and Scripting

Select lines in which column have value greater than some percent of total file lines

i have a file in following format 1 32 3 4 6 4 4 45 1 45 4 61 54 66 4 5 65 51 56 65 1 12 32 85 now here the total number of lines are 8(they vary each time) Now i want to select only those lines in which the values... (6 Replies)
Discussion started by: vaibhavkorde
6 Replies

4. Shell Programming and Scripting

Extracting specific lines of data from a file and related lines of data based on a grep value range?

Hi, I have one file, say file 1, that has data like below where 19900107 is the date, 19900107 12 144 129 0.7380047 19900108 12 168 129 0.3149017 19900109 12 192 129 3.2766666E-02 ... (3 Replies)
Discussion started by: Wynner
3 Replies

5. Shell Programming and Scripting

select lines with certain values on certain fields with awk

I need a awk command to select from a log-file only the lines that have on the 2nd field (considering "|" separator) one of the values 10.216.22.XX or 10.216.22.YY or 10.216.22.ZZ and on the 4th field only values that contain strictly digits. I want the command to work parsing the file only once (I... (2 Replies)
Discussion started by: black_fender
2 Replies

6. UNIX for Advanced & Expert Users

Sort mixed data file

I have a text file and each field is separated by semicolon ( ; ). Field number 7 is internally separated by comma ( , ) and pipe ( | ) symbol. I want to sort file based on three different fields which are marked in BOLD. Here first BOLD field will have numbers upto the length of 9 characters,... (6 Replies)
Discussion started by: jnrohit2k
6 Replies

7. Shell Programming and Scripting

Using awk to parse a file with mixed formats in columns

Greetings I have a file formatted like this: rhino grey weight=1003;height=231;class=heaviest;histology=9,0,0,8 bird white weight=23;height=88;class=light;histology=7,5,1,0,0 turtle green weight=40;height=9;class=light;histology=6,0,2,0... (2 Replies)
Discussion started by: Twinklefingers
2 Replies

8. Shell Programming and Scripting

Select only the lines of a file starting with a field which is matcing a list. awk?

Hello I have a large file1 which has many events like "2014010420" and following lines under each event that start with text . It has this form: 2014010420 num --- --- num .... NTE num num --- num... EFA num num --- num ... LASW num num --- num... (9 Replies)
Discussion started by: phaethon
9 Replies

9. Shell Programming and Scripting

awk to select lines with maximum value of each record based on column value

Hello, I want to get the maximum value of each record separated by empty line based on the 3rd column of each row within each record? Input: A1 chr5D 634 7 82 707 A2 chr5D 637 6 82 713 A3 chr5D 637 5 82 713 A4 chr5D 626 1 82 704... (4 Replies)
Discussion started by: yifangt
4 Replies

10. Shell Programming and Scripting

awk to select 2D data bins

I wish to use AWK to do something akin: Select all 2D data with 1<$1<2 and -7.5<$2<-6.5 But it's not working awk 'END {print ($1<=2&&$1>=1&&$2<=-6.5&&$2>=-7.5)}' bla Data: -1.06897 -8.04482 -61.469 -1.13613 -8.04482 -61.2271 -1.00182 -8.04482 -61.2081 -1.06897 -8.13518 -60.8544... (2 Replies)
Discussion started by: chrisjorg
2 Replies

LEARN ABOUT REDHAT

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)
All times are GMT -4. The time now is 08:23 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy