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Full Discussion: Find users in 24 hour
Top Forums Shell Programming and Scripting Find users in 24 hour Post 302786053 by Chubler_XL on Tuesday 26th of March 2013 06:37:16 PM
Old 03-26-2013
You could process the output of last -t looking for "gone - no logout" where users are in at a particular time:

Here is split that day up into 5min blocks and check each block:

Code:
STS=$(date -d "$*" +%s)
INC=0
MAX=0
while [ $INC -lt $((60*60*24)) ]
do
   CNT=$(last -t $(date -d @$((STS+INC)) +%Y%m%d%H%M%S) | grep "gone" | wc -l)
   if [ $CNT -gt $MAX ]
   then
       MTIME=$((STS+INC))
       MAX=$CNT
   fi
   let INC=INC+5*60
done

echo "Maximum users: $MAX at $(date -d @$MTIME)"

Call it like this:

Code:
$ max_user.sh 26 Mar 2013
Maximum users: 4 at Tue Mar 26 15:05:00 EST 2013

---------- Post updated at 08:37 AM ---------- Previous update was at 08:26 AM ----------

Note: this is very dependent on your last -t command output under Fedora I get something like this, which is what I developed/tested with:

Code:
last -t 20120727163900
chubler  pts/1        192.168.1.3      Fri Jul 27 16:38    gone - no logout 
chubler  pts/1        192.168.1.3      Fri Jul 27 16:38 - 16:38  (00:00)    
chubler  pts/1        192.168.1.3      Fri Jul 27 16:36 - 16:36  (00:00)    
chubler  pts/1        192.168.1.3      Fri Jul 27 16:34 - 16:34  (00:00)    
chubler  pts/0        :0               Fri Jul 27 16:25    gone - no logout 
chubler  :0           :0               Fri Jul 27 16:14    gone - no logout

 

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LEARN ABOUT SUNOS

sulog

sulog(4)							   File Formats 							  sulog(4)

NAME

       sulog - su command log file

SYNOPSIS

       /var/adm/sulog

DESCRIPTION

       The  sulog file is a record of all attempts by users on the system  to execute the su(1M) command.  Each time  su(1M) is executed, an entry
       is added to the sulog file.

       Each entry in the sulog file is a single line of the form:

	      SU date time
	      result port user-newuser

       where

       date	       The month and date su(1M) was executed.	date is displayed in the form  mm/dd where  mm is the month number and dd  is  the
		       day number in the month.

       time	       The  time   su(1M) was executed. time is displayed in the form  HH/MM where  HH is the hour number (24 hour system) and	MM
		       is the minute number.

       result	       The result of the  su(1M) command.  A ` + ' sign is displayed in this field if the su attempt was successful; otherwise	 a
		       ` - ' sign is displayed.

       port	       The name of the terminal device from which  su(1M) was executed.

       user	       The user id of the user executing the  su(1M) command.

       newuser	       The user id being switched to with  su(1M).

EXAMPLES

       Example 1: A sample sulog file.

       Here is a sample sulog file:

       SU 02/25 09:29 + console root-sys
       SU 02/25 09:32 + pts/3 user1-root
       SU 03/02 08:03 + pts/5 user1-root
       SU 03/03 08:19 + pts/5 user1-root
       SU 03/09 14:24 - pts/5 guest3-root
       SU 03/09 14:24 - pts/5 guest3-root
       SU 03/14 08:31 + pts/4 user1-root

FILES

       /var/adm/sulog	       su log file

       /etc/default/su	       contains the default location of  sulog

SEE ALSO

       su(1M)

SunOS 5.10							    6 Jun 1994								  sulog(4)
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