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Shell Programming and Scripting

Time setup for different date

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# 1  
Old 07-12-2016
Time setup for different date
I want to get sleep time in T variable to start my script next day 22:59:59, if start and current date are different I am not able to achieve that(which is giving negative value), so am just adding +23 hours. But if the date are same I can able to get the sleep time, how to get sleep time if the date are different
Code:
if [ $STARTDATE = $CURRENTDATE ]; then \
T=$(date +%M/%D/%Y %I:%M %p  --date="$NOW+ 23 hour")
else 
current=$(date -d --date="22:59:59)
eat=$(date -d --date="$EARLYSTART")
T=`expr $current - $eat`
fi

sleep $T

# 2  
Old 07-12-2016
Having a script sleep for more than 24 hours - although, in principle, technically possible - to me sounds like sth. to avoid. Did you consider cron or at?

Anyway, for assigning T , try (untested!, assuming you use a recent bourne compatible shell like e.g.bash)
Code:
T=$(( $(date -d "00:00:00" +%s) + 172799 - $(date +%s) ))

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