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Full Discussion: Add leading zeroes to numbers in a file
Top Forums Shell Programming and Scripting Add leading zeroes to numbers in a file Post 302206256 by raidzero on Tuesday 17th of June 2008 10:31:07 AM
Old 06-17-2008
Add leading zeroes to numbers in a file
Hello, I am (trying) to write a script that will check to see how many users are logged on to my machine, and if that number is more than 60 I need to kill off all the oldest sessions that are over 60. So far I have been able to check how many users are on and now I am at the part where I have to actually kill them off. I have chosen to write the idle times for all the logged on users into a file, but I need to add leading zeroes to them in order to properly sort them. How do I do this? the file is /tmp/uidle. This is my code so far:

Code:
numusers=$(who -q | grep Total | tr -s " " | cut -d" " -f3)                
echo Total number of users: ${numusers}                                    
if test $numusers -gt 60; then                                             
diff=$(expr $numusers - 60)                                                
echo "There are $diff too many users, killing the $diff oldest users..."   
who -u | sort -k4.2,6 | grep bhb | tr -s " " | cut -d" " -f5 >> /tmp/uidle 
else                                                                       
echo "There are less than 60 users. Exiting"                               
fi                                                                         
exit 1

Thanks
 

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LEARN ABOUT ULTRIX

ruptime

ruptime(1c)															       ruptime(1c)

Name
       ruptime - show host status of local machines

Syntax
       ruptime [ options ] [ machinename ]

Description
       The  command  gives  a  status  line  like  for each machine on the local network.  If a machinename is given, the status of only the named
       machine is given.  These status lines are formed from packets broadcast by each host on the network once a minute.

       Machines for which no status report has been received for 5 minutes are shown as being down.

Options
       -a   Users idle an hour or more are not counted unless this option is specified.

       -d   Display only those hosts that are considered down.

       -l   Sort the status list by load average.  If more than one sort option is given, uses the last one.

       -r   Show only hosts that are up and running.

       -t   Sort the status list by uptime.  If more than one sort option is given, uses the last one.

       -u   Sort the status list by number of users.  If more than one sort option is given, uses the last one.

       -nn  Show only those hosts with nn or more users.

Restrictions
       Because the daemon sends its information in broadcast packets it generates a large amount of network traffic.  On large networks the  extra
       traffic	may  be  objectionable.   Therefore,  the  daemon is disabled by default.  To make use of the daemon for both the local and remote
       hosts, remove the comment symbols (#) from in front of the lines specifying in the file.

       If the daemon is not running on a remote machine, the machine may incorrectly appear to be down when you use the command to  determine  its
       status.	See the reference page for more information.

       If  a  system  has  more  than 40 users logged in at once, the number of users displayed by the command is incorrect.  Users who login to a
       machine after that point fail to increment the user count that appears in the output of the command.  This is due to the maximum size limit
       of an Ethernet packet, which is 1500 bytes, and the fact that the daemon must broadcast its information in a single packet.

Files
       /usr/spool/rwho/whod.*	Information about other machines

See Also
       rwho(1c), rwhod(8c)

																       ruptime(1c)
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