need to assign serial based on date

clsonnt · 10-28-2004, 12:21 PM

I am trying to come up with a way to assign a number indicating the week number based on the date.
e.g.
5 -> 1
12 -> 2

I've tried using a case construct but can't get it to deal with a range of numbers.
What I tried:

Code:

case "$backupdte" in
             1-7      ) serial="1";;
             8-14    ) serial="2";;
             15-21  ) serial="3";;
             22-28  ) serial="4";;
             29-31  ) serial="5";;
esac

What works:

Code:

case "$backupdte" in
             2    ) serial="1";;
             9    ) serial="2";;
             16  ) serial="3";;
             23  ) serial="4";;
             30  ) serial="5";;
esac

Any suggestions?

Hko · 10-28-2004, 12:27 PM

How about:

Code:

#!/bin/bash
date +%V

clsonnt · 10-28-2004, 12:34 PM

I guess I need to clarify.....
I need to assign numbers 1 - 5 corresponding to the week number based on the date
e.g.
Oct 1 - Oct 7 -> 1
Oct 8 - Oct 14 -> 2
Oct 15 - Oct 21 -> 3
etc....

Hko · 10-28-2004, 01:08 PM

So, the value the $backupdte variable is just some day of the month, like 1,2,3,...31 ? Not something like "09312004" or similar?

Doesn't the day of the week make any difference for the week-number? I mean, if $backupdte is "2" should the script always calculate the week number to be "1", no matter if "2" is on a saturday, or a monday?

OK, I assume it's just 1,2,3...31 and the day of the week doesn't matter. Then use:

Code:

#!/bin/bash
serial=$((1+($backupdte-1)/7))
echo $serial

If you want the weeknumber of the current date:

Code:

serial=$((1+($(date +%e)-1)/7))

Hko · 10-28-2004, 01:36 PM

By the way, this would work:

Code:

case "$1" in
	[1-7]  ) serial="1";;

But this would not:

Code:

case "$1" in
	[8-14] ) serial="2";;

Because this range trick ( [1-7] ) only works with single characters.

So, when you realy want to use "case", you're stuck with enumerating all of the day-of-the-moth numbers that have more then 1 digit:

Code:

#!/bin/bash

case "$backupdte" in
	[1-7]  ) serial="1";;
	8|9|10|11|12|13|14) serial="2";;
	15|16|17|18|19|20|21) serial="3";;
	22|23|24|25|26|27|28) serial="4";;
	29|30|31) serial="5";;
esac

echo $serial

or do something else:

Code:

if [ $backupdte -le 7 ] ; then serial=1
elif [ $backupdte -le 14 ] ; then serial=2
elif [ $backupdte -le 21 ] ; then serial=3
elif [ $backupdte -le 28 ] ; then serial=4
elif [ $backupdte -le 31 ] ; then serial=5
else serial="ERROR"
fi

echo $serial

clsonnt · 10-28-2004, 04:26 PM

Well......
[1-7] ) serial="1";;
Didn't work. Not sure why but...

8|9|10|11|12|13|14) serial="2";;
Worked like a CHAMP!!! Not quite as clean but I can live with it.

the if ->elseif worked fine too. So I have to different approaches todealing with the problem

THANK YOU
Thank You
thank you!!!