[X-Unix] Bash scripting Question

[Eric F Crist]

Russell,

I would ask first if there is a different exit code for someone being  
connected and nobody being connected.  You can check this by running  
fmsadmin and checking the exit code immediately afterward.  First,  
run fmsadmin with someone connected to the flash server.  After it  
executes, type "echo $?" at the command line (minus the quotes).  You  
should get a number and your command line again.  Write this code  
down and execute fmsadmin again, this time with everyone  
disconnected.  After it executes, type "echo $?" again, without the  
quotes.  You may get the same number, but lets hope it's different.

Now, IF and only IF you have two different exit codes, something like  
the following should work for you:

#!/bin/sh
#End script after 210 seconds or exit code of 0.

## Initialize the variables. ##
starttime=$(date +%s)

# Set this variable to the number of seconds you want the program
# to run before timing out.
endtime=210
exitnow=0
runtime=0
calctime=0
exitcode=99

## Time to do the dirty work. ##

while [ "$exitnow" -ne "1" ]; do
         if [ "$runtime" -lt "$endtime" ]; then
                 if [ "$exitcode" -ne "0" ]; then
                         fmsadmin status Clients
                         exitcode=$?
                         echo "Running for $runtime seconds."
                 else
                          exitnow=1
                 fi
         else
                 exitnow=1
         fi
         calctime=$(date +%s)
         runtime=$(( $calctime - $starttime))
done
echo "Exited at `date`."


Any questions, let me know.

Eric Crist


On Aug 22, 2006, at 11:11 AM, Russell McGaha wrote:

> Folks;
> 	I've got a situation where I running a script and need to wait  
> till the output of a command is null:
>
> ex.
> 	NotNull = true
> 	While NotNull
> do
> 	fmsadmin status Clients   #[returns a list of connected clients;  
> I'd like to got thru
> 							  this loop until either the output of the command is null or
> 							  About 2-5 minutes have gone by]#
> done
>
> Can anyone give ANY pointers or examples on how to do this?
>
> Russell
>
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-----
Eric F Crist
Secure Computing Networks