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Need help with incrementing date in while loop.

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# 1  
Old 08-05-2008
Need help with incrementing date in while loop.
I need to execute a KornShell (SunOS 5.9) script against a range of dates:

endDate=20080804
extractDate=20080401
while [ $currentDate -le $endDate ]; do
batch < scripts/myshellscript.sh $extractDate
## add 1 day to extractDate ##
done

My question is how do I increment the extractDate variable and still have it give a valid date?
# 2  
Old 08-05-2008
For your example only - Aug 1 to Aug 4 2008 this will work. It will not work for crossing month-end boundaries.

Code:
endDate=20080804
extractDate=20080401
while [ $currentDate -le $endDate ]; do
   batch < scripts/myshellscript.sh $extractDate
   extractDate=$(( extractDate + 1 ))
done

# 3  
Old 08-05-2008
You can use convert current/past time in epoch time and do the calculation. Once got the result again convert it back to normal time and display it.

for more details about epoch time.
Unix time - Wikipedia, the free encyclopedia

- nilesh
# 4  
Old 08-05-2008
maybe with the "date" comand you can do the math
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