awk last n lines of file Post: 302905888

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Top Forums Shell Programming and Scripting awk last n lines of file Post 302905888 by 1in10 on Sunday 15th of June 2014 09:39:42 PM

06-15-2014

Registered User

Code:

#!/bin/bash 

#path=/home/Desktop/bashes
machine=$(uname -n);
R=`date +%A'  '%d'/'%m'/'%y' die '%V'.'week`;
V=`date +%x`              #will be used later
T=$((86400/3600));          #will be used later    

echo $T "not yet";

# shows me the actual user
echo $USER;

if (( "$T" < 31 ))
then 
    echo "today is" $R 
    else :
fi;

# I do know that this notation below of string4 and string5 is not the pretty version, but I want to keep it!!!

string4=`uptime`
string5=`date +%x`

echo "uptime" $USER "an" $machine " " ${string4:13:5} " " ${string5}  | head -c 10K >> /home/uplog.txt | awk  'END{print NR " full " NF$5; exit}' /home/uplog.txt

This is the the whole script. Indeed I just want to have a maximum of lines of 200. Nothing else.
If I cut out the first time >> /home/uplog.txt the file won't be updated. So it may remain. I tested it without and it stopped at that line. What gives me some hope was an old thread right here that was turning the file upside down.

This script shall keep the last 200 times of uptime of a user, that simple. Furthermore I want to fetch the last seven and the last thirty entries of it for a calculation, average uptime and total uptime.
Beyond this I want to switch after a certain value of uptime my MAC-address or to make a redial.
@Don Cragun sure I am willing to learn, I think that keeps me afloat. For not having at least the five posts here I have to wait to send the link. The user that gave that hint is cfajohnson and his answer dates back to 2007.

Last edited by Don Cragun; 06-15-2014 at 11:41 PM.. Reason: Change ICODE tags to CODE tags.

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LEARN ABOUT OPENSOLARIS

uptime

uptime(1)							   User Commands							 uptime(1)

NAME

       uptime - show how long the system has been up

SYNOPSIS

       uptime

DESCRIPTION

       The uptime command prints the current time, the length of time the system has been up, and the average number of jobs in the run queue over
       the last 1, 5 and 15 minutes. It is, essentially,  the first line of a w(1) command.

EXAMPLES

       Below is an example of the output uptime provides:

	 example% uptime
	 10:47am  up 27 day(s), 50 mins,  1 user,  load average: 0.18, 0.26, 0.20

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------------------------------------+
       |ATTRIBUTE TYPE		      ATTRIBUTE VALUE		   |
       |Availability		      SUNWcsu			   |
       +-----------------------------------------------------------+

SEE ALSO

       w(1), who(1), whodo(1M), attributes(5)

NOTES

       who -b gives the time the system was last booted.

SunOS 5.11							    18 Mar 1994 							 uptime(1)