Sponsored Content
Top Forums UNIX for Dummies Questions & Answers Uniq using only the first field Post 302158463 by Tytalus on Tuesday 15th of January 2008 11:26:50 AM
Old 01-15-2008
The neat nawk solution will not always provide the same solution independent of line ordering though...

something like:

Code:
awk '{if ( length($0) > length(a[$1]) ) {a[$1]=$0}} END {for (i in a){print a[i]}}' file

will ensure you get the longest line (if that is a requirement).
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

How to uniq third field in a file

Hi ; I have a question regarding the uniq command in unix How do I uniq 3rd field in a file ? original file : zoom coord 39 18652 39 18652 zoom coord 39 18653 39 18653 zoom coord 39 18818 39 18818 zoom coord 39 18840 39 18840 zoom coord 41 15096 41 15096 zoom... (1 Reply)
Discussion started by: babycakes
1 Replies

2. Shell Programming and Scripting

How to use uniq on a certain field?

How can I use uniq on a certain field or what else could I use? If I want to use uniq on the second field and the output would remove one of the lines with a 5. bob 5 hand jane 3 leg jon 4 head chris 5 lungs (1 Reply)
Discussion started by: Bandit390
1 Replies

3. UNIX for Dummies Questions & Answers

Difference between plain "uniq" and "uniq -u"

Dear all, It's not entirely clear to me from manpage the difference between them. Why we still need "-u" flag? - monkfan (3 Replies)
Discussion started by: monkfan
3 Replies

4. UNIX for Dummies Questions & Answers

find uniq lines in file, using the first field of line

Hello all, new to unix and have just found the forum. I think I will be here quite often, and hope that in time i will be able to provide soem help, role on not being a newbie anymore :) I have a question which iI am hoping someone could help me with. If i have a file with lines in in thus... (8 Replies)
Discussion started by: grom
8 Replies

5. Shell Programming and Scripting

Uniq based on first field

Hi New to unix. I want to display only the unrepeated lines from a file using first field. Ex: 1234 uname1 status1 1235 uname2 status2 1234 uname3 status3 1236 uname5 status5 I used sort filename | uniq -u output: 1234 uname1 status1 1235 uname2 status2 1234 uname3 status3 1236... (10 Replies)
Discussion started by: venummca
10 Replies

6. Shell Programming and Scripting

Sort field and uniq

I have a flatfile A.txt 2012/12/04 14:06:07 |trees|Boards 2, 3|denver|mekong|mekong12 2012/12/04 17:07:22 |trees|Boards 2, 3|denver|mekong|mekong12 2012/12/04 17:13:27 |trees|Boards 2, 3|denver|mekong|mekong12 2012/12/04 14:07:39 |rain|Boards 1|tampa|merced|merced11 How do i sort and get... (3 Replies)
Discussion started by: sabercats
3 Replies

7. Shell Programming and Scripting

Printing uniq first field with the the highest second field

Hi All, I am searching for a script which will produce an output file with the uniq first field with the second field having highest value among all the duplicates.. The output file will produce only the uniqs which are duplicate 3 times.. Input file X 9 B 5 A 1 Z 9 T 4 C 9 A 4... (13 Replies)
Discussion started by: ailnilanjan
13 Replies

8. Linux

How do I format a Date field of a .CSV file with multiple commas in a string field?

I have a .CSV file (file.csv) whose data are all enclosed in double quotes. Sample format of the file is as below: column1,column2,column3,column4,column5,column6, column7, Column8, Column9, Column10 "12","B000QRIGJ4","4432","string with quotes, and with a comma, and colon: in... (3 Replies)
Discussion started by: dhruuv369
3 Replies

9. Shell Programming and Scripting

Filter uniq field values (non-substring)

Hello, I want to filter column based on string value. All substring matches are filtered out and only unique master strings are picked up. infile: 1 abcd 2 abc 3 abcd 4 cdef 5 efgh 6 efgh 7 efx 8 fgh Outfile: 1 abcd 4 cdef 5 efgh 7 efxI have tried awk '!a++; match(a, $2)>0'... (32 Replies)
Discussion started by: yifangt
32 Replies

10. Shell Programming and Scripting

Need help in awk: running a loop with one column and segregate data 4 each uniq value in that field

Hi All, I have a file like this(having 2 column). Column 1: like a,b,c.... Column 2: having numbers. I want to segregate those numbers based on column 1. Example: file. a 5 b 9 b 620 a 710 b 230 a 330 b 1910 (4 Replies)
Discussion started by: Raza Ali
4 Replies
ucblinks(1B)					     SunOS/BSD Compatibility Package Commands					      ucblinks(1B)

NAME
ucblinks - adds /dev entries to give SunOS 4.x compatible names to SunOS 5.x devices SYNOPSIS
/usr/ucb/ucblinks [-e rulebase] [-r rootdir] DESCRIPTION
ucblinks creates symbolic links under the /dev directory for devices whose SunOS 5.x names differ from their SunOS 4.x names. Where possi- ble, these symbolic links point to the device's SunOS 5.x name rather than to the actual /devices entry. ucblinks does not remove unneeded compatibility links; these must be removed by hand. ucblinks should be called each time the system is reconfiguration-booted, after any new SunOS 5.x links that are needed have been created, since the reconfiguration may have resulted in more compatibility names being needed. In releases prior to SunOS 5.4, ucblinks used a nawk rule-base to construct the SunOS 4.x compatible names. ucblinks no longer uses nawk for the default operation, although nawk rule-bases can still be specifed with the -e option. The nawk rule-base equivalent to the SunOS 5.4 default operation can be found in /usr/ucblib/ucblinks.awk. OPTIONS
-e rulebase Specify rulebase as the file containing nawk(1) pattern-action statements. -r rootdir Specify rootdir as the directory under which dev and devices will be found, rather than the standard root directory /. FILES
/usr/ucblib/ucblinks.awk sample rule-base for compatibility links ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
devlinks(1M), disks(1M), ports(1M), tapes(1M), attributes(5) SunOS 5.10 13 Apr 1994 ucblinks(1B)
All times are GMT -4. The time now is 08:50 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy