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UNIX for Dummies Questions & Answers

Sleep Until Query

 
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# 8  
Old 01-13-2012
How about this
Code:
                                          
#!/bin/bash                               
STOP=`echo 14 \* 3600 + 0 \* 60 |bc`      
START=`echo 20 \* 3600 + 10 \* 60 |bc`    
echo $$ >proc.pid                         
while [ -r proc.pid ]                     
do                                        
H=`date +%H`                              
M=`date +%M`                              
SECONDS=`echo $H \* 3600 + $M \* 60 |bc`  
if [ $SECONDS -gt $STOP ]                 
then                                      
        DIFF=`echo $START - $SECONDS |bc` 
        if [ $DIFF -gt 0 ]                
        then                              
                echo $DIFF                
                #sleep $DIFF              
        fi                                
fi                                        
echo Done `date`                          
sleep 5                                   
done

# 9  
Old 01-14-2012
Reference post #5.
Quote:
while [ $curr_time -ge $time7pm and $curr_time -le $time630am ]
The reason the script did not exit is because the "and" condition is incorrect.
Should have been:
Code:
while [ $curr_time -ge $time7pm -a $curr_time -le $time630am ]

But there is a design issue with using integer comparisons with HHMM fields because the leading zero disappears for hours less than 10. Mathematically this in itself would not be an issue if we had 100 minutes to the hour - but we don't!


jgt's IDEA is much better (but the script has problems). Do integer comparision in whole minutes (not seconds unless you need that accuracy).
I can't see how that script gets out of the while loop. Personally I would use "while true" and then the "break" command to get out of the while loop when the condition is met.
Last edited by methyl; 01-14-2012 at 06:02 PM.. Reason: removed wrong assumption
# 10  
Old 01-14-2012
I guess I should have added more detail.
The script runs until proc.pid is deleted by some other process.
Since we didn't have the complete original script there was no explanation of how the script ever ends. The OP asked that his script run continuously but not between 2pm and 4pm.
He should comment the echo $DIFF, and un-comment the sleep $DIFF lines, and replace "echo Done `date`, sleep 5" with his own script.
Once this is done, his original script will execute repeatedly until 2pm at which point it will sleep (approximately 7200 seconds) until 4pm, and then continue.
 
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