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Top Forums UNIX for Beginners Questions & Answers Find lines with duplicate values in a particular column Post 303039634 by kaktus on Thursday 10th of October 2019 06:34:15 PM
Old 10-10-2019
Find lines with duplicate values in a particular column

I have a file with 5 columns. I want to pull out all records where the value in column 4 is not unique. For example in the sample below, I would want it to print out all lines except for the last two.

Code:
40991764	2419	724	47182	Cand A
40992936	3591	724	47182	Cand B
40993016	3671	724	47182	Cand C
40993876	4531	724	10154	Strep A
40993878	4533	724	10154	Strep B
40993990	4645	724	58899	Cala A
40993991	4646	724	63849	Myco A

I tried this:
Code:
awk -F '\t' 'a=x[$4]{print a"\n"$0;} {x[$4]=$0;}'

It works well if there is only one duplicate per line (10154 above), but if there is more than 1 duplicate (47182 above), it prints out one of the matched duplicates twice (Cand B):

Code:
40991764	2419	724	47182	Cand A
40992936	3591	724	47182	Cand B
40992936	3591	724	47182	Cand B
40993016	3671	724	47182	Cand C
40993876	4531	724	10154	Strep A
40993878	4533	724	10154	Strep B

How can I get it to print each unique line only once?
 

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IRSEND(1)								FSF								 IRSEND(1)

NAME
irsend - basic LIRC program to send infra-red commands SYNOPSIS
irsend [options] DIRECTIVE REMOTE CODE [CODE...] DESCRIPTION
Asks the lircd daemon to send one or more CIR (Consumer Infra-Red) commands. This is intended for remote control of electronic devices such as TV boxes, HiFi sets, etc. DIRECTIVE can be: SEND_ONCE - send CODE [CODE ...] once SEND_START - start repeating CODE SEND_STOP - stop repeating CODE LIST - list configured remote items SET_TRANSMITTERS - set transmitters NUM [NUM ...] SIMULATE - simulate IR event REMOTE is the name of a remote, as described in the lircd configuration file. CODE is the name of a remote control key of REMOTE, as it appears in the lircd configuration file. NUM is the transmitter number of the hardware device. For the LIST DIRECTIVE, REMOTE and/or CODE can be empty: LIST "" "" - list all configured remote names LIST REMOTE "" - list all codes of REMOTE LIST REMOTE CODE - list only CODE of REMOTE The SIMULATE command only works if it has been explicitly enabled in lircd. -h --help display usage summary -v --version display version -d --device use given lircd socket [/var/run/lirc/lircd] -a --address=host[:port] connect to lircd at this address -# --count=n send command n times EXAMPLES
irsend LIST DenonTuner "" irsend SEND_ONCE DenonTuner PROG-SCAN irsend SEND_ONCE OnkyoAmpli VOL-UP VOL-UP VOL-UP VOL-UP irsend SEND_START OnkyoAmpli VOL-DOWN ; sleep 3 irsend SEND_STOP OnkyoAmpli VOL-DOWN irsend SET_TRANSMITTERS 1 irsend SET_TRANSMITTERS 1 3 4 irsend SIMULATE "0000000000000476 00 OK TECHNISAT_ST3004S" FILES
/etc/lirc/lircd.conf Default lircd configuration file. It should contain all the remotes, their infra-red codes and the corresponding timing and wave- form details. DIAGNOSTICS
If lircd is not running (or /var/run/lirc/lircd lacks write permissions) irsend aborts with the following diagnostics: "irsend: could not connect to socket" "irsend: Connection refused" (or "Permission denied"). SEE ALSO
The documentation for lirc is maintained as html pages. They are located under html/ in the documentation directory. lircd(8), mode2(1), smode2(1), xmode2(1), irrecord(1), irw(1), http://www.lirc.org. irsend 0.8.7pre1 May 2010 IRSEND(1)
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