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Shell Programming and Scripting

Loop exit control

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# 1  
Old 01-09-2011
Loop exit control
Hi

I would like to exit the loop below on <Enter> even if it sleeps. Is it possible?
Code:
              while true
               do
                  my_procedure;
                  sleep 60
               done

Thanks
Last edited by jim mcnamara; 01-09-2011 at 10:38 PM.. Reason: Please use code tags
# 2  
Old 01-09-2011
Are you using the bash shell? use read -t
Code:
while true
do
 my_procedure;
 read -t 60  dummy
done

# 3  
Old 01-10-2011
I am using ksh. I will look for similar info there in man pages. But if you know pls let me know. Thankyou
# 4  
Old 01-10-2011
One technique in "ksh" is to use a flag file.

Code:
while true
do
       my_procedure
       if [ -f /tmp/my_stop_flag ]
       then
                 rm /tmp/my_stop_flag
                 break
       fi
       sleep 60
done

To stop the loop.
touch /tmp/my_stop_flag

Also note that it is never necessary or desirable to end a "ksh" line in a semi-colon.
# 5  
Old 01-10-2011
Thanks !
# 6  
Old 01-12-2011
The option with stop flag Ok but it will not interupt waiting in progress.
# 7  
Old 01-12-2011
We can reduce the reaction time by checking frequently during the sleep period.

Code:
while true
do
       my_procedure
       for sleep_time in 5 5 5 5 5 5 5 5 5 5 5 5
       do
           if [ -f /tmp/my_stop_flag ]
           then
                 rm /tmp/my_stop_flag
                 break 2
           fi
           sleep ${sleep_time}
       done
done

To stop the loop.
touch /tmp/my_stop_flag
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