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Full Discussion: Calculating average for every Nth line in the Nth column
Top Forums Shell Programming and Scripting Calculating average for every Nth line in the Nth column Post 302622507 by CarloM on Thursday 12th of April 2012 08:32:58 AM
Old 04-12-2012
I'm not clear on whether your identifying column is '1945-05', '1945', or just '05'?

You could do something like:
Code:
awk -F, '{totals[$1]=+$2;counts[$1]++} END {for (i in totals) { print i, totals[i]/counts[i]}}' file

(1945-05)

Or:
Code:
awk -F"-|," '{totals[$2]=+$3;counts[$2]++} END {for (i in totals) { print i, totals[i]/counts[i]}}' file

(05 - $1 instead of $2 for 1945)
Last edited by CarloM; 04-12-2012 at 09:39 AM..
 

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LEARN ABOUT BSD

ac

AC(8)							      System Manager's Manual							     AC(8)

NAME

       ac - login accounting

SYNOPSIS

       /usr/sbin/ac [ -w wtmp ] [ -p ] [ -d ] [ people ] ...

DESCRIPTION

       Ac  produces a printout giving connect time for each user who has logged in during the life of the current wtmp file.  A total is also pro-
       duced.  -w is used to specify an alternate wtmp file.  -p prints individual totals; without this  option,  only	totals	are  printed.	-d
       causes  a printout for each midnight to midnight period.  Any people will limit the printout to only the specified login names.	If no wtmp
       file is given, /usr/adm/wtmp is used.

       The accounting file /usr/adm/wtmp is maintained by init and login.  Neither of these programs creates the file, so if it does not exist	no
       connect-time  accounting  is  done.  To start accounting, it should be created with length 0.  On the other hand if the file is left undis-
       turbed it will grow without bound, so periodically any information desired should be collected and the file truncated.

FILES

       /usr/adm/wtmp

SEE ALSO

       init(8), sa(8), login(1), utmp(5).

4th Berkeley Distribution					 November 16, 1996							     AC(8)
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