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Top Forums Shell Programming and Scripting awk - how to get difference of the same column when other column matches Post 302794955 by Lakshmikumari on Wednesday 17th of April 2013 04:04:47 AM
Old 04-17-2013
awk - how to get difference of the same column when other column matches

I have a file like this :
Code:
# cat list
cucm, location,76,2
cucm1,location1,76,4
cucm,location,80,8
cucm1,location1,90,8
cucm1,location1,87,11
cucm,location,67,9

and I want output like this :
Code:
cucm,location,76,2
cucm1,location1,76,4
cucm,location,80, 6 ===> (8-2 =6)
cucm1,location1,90,4 ====>(8-4=4)
cucm1,location1,87,3
cucm,location,67,1

Only when the first and second column matches, I should take a difference of fourth column in the consecutive matching rows.

How will I achieve it. ?

I tried this :
Code:
awk -F"," '/cucm1,location1/ {print $1, $2, $3, $4, $4-prev;prev=$4;}' list

This works. But i may not know the contents in the runtime. Hence it has to check if column1 and column2 matches and then do a diff.

Please help

Last edited by Franklin52; 04-17-2013 at 05:09 AM.. Reason: Please use code tags
 

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IRSEND(1)							   User Commands							 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 0.9.0-pre1 October 2010 IRSEND(1)
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