Shell Script Date Problem....

Posted: Fri Jan 06, 2006 7:35 am

Greetings,
I have a shell script that outputs a date (amoung other things) to retrive some files from a remote server. When the new year rolled over it stopped working.

I found out the output from the script is giving me a date of 5 instead of 005. Here is the date portion of the script...

year=`date +%Y`
today=`date +%j`
day=$((today-1))

I do not know a thing about shell scripting....but I do know that the date must be in this format for the output.

001, 002, 003, 114, 365

It must have all three digits to work right.

Could someone "In the KNOW" either point me in the right direction or show me the error of my ways.

Thank You for the help!!

Dawg

Site Admin/Owner Joined: Aug 27, 2002 Posts: 17088

The rollover of the year would not have altered the $day variable. That would have been the same. If you run this in a shell you get this:

[~]# year=`date +%Y`; today=`date +%j`; day=$((today-1))
[~]# echo $year
2006

[~]# echo $today
006

[~]# echo $day
5

$day is a calculation for yesterday and would have been formatted like this for 2005 also. I doubt that is your problem.

Posted: Fri Jan 06, 2006 4:08 pm

Raven,
The output was coming out as a single digit like today would have been 6 and it needed to be 006 because of the name of the remote file.

I just looked at what you put more closely....I will go look at it some more...

Thank You for your time!!

Dawg

Posted: Fri Jan 06, 2006 4:12 pm

As you can see from the previous post, it definitely is 006 because of the %j option. I don't know.

Posted: Fri Jan 06, 2006 7:42 pm

Ok...I went looking...

This is the script as written...

Code:




#!/bin/bash





year=`date +%Y`


today=`date +%j`


day=$((today-1))


archive="/maps/mysite/data"


scriptdir="/maps/mysite/scripts"





cd ${archive}/workspace





wget -r -np -nd -A file.name http://site.name/level3/husf/site/${year}/${day}/1km/pass/intermediate/





wget -r -np -nd -A file.name http://site.name/level3/husf/site/${year}/${day}/1km/pass/intermediate/

This is the script after I changed it...

Code:




#!/bin/bash





year=`date +%Y`


today=`date +%j`


day=$((today-1))


archive="/maps/mysite/data"


scriptdir="/maps/mysite/scripts"





cd ${archive}/workspace





wget -r -np -nd -A file.name http://site.name/level3/husf/site/${year}/00${day}/1km/pass/intermediate/





wget -r -np -nd -A file.name http://site.name/level3/husf/site/${year}/00${day}/1km/pass/intermediate/

Notice the 00 between year and day.

Before I changed it the resulting url would come out like this...

Code:




http://site.name/level3/husf/site/2006/6/1km/pass/intermediate/

Instead of like this....

Code:




http://site.name/level3/husf/site/2006/006/1km/pass/intermediate/

Would this be a correct fix for this?

Code:




#!/usr/bin/ksh


year=`date +%Y`


today=`date +%j`


day=`printf "%003d" $((today-1))`


wget -r -np -nd -A file.name http://site.name/level3/husf/site/${year}/${day}/1km/pass/intermediate/

As usual THANK YOU for your time!!

Dawg

PS....
IS there a good referance for this stuff some where....I can not find anything like a Manual....Just a couple sites with a little of this and a little of that?

I Like to SAVE YOU for the really hard stuff....Cause Raven Rocks Da Code!

Wink

Posted: Fri Jan 06, 2006 7:59 pm

But it would have been like that for any year. The %j prefixes the day with as many zeroes as it needs to be 3 long. With your code, when the day is 10 then you will have 0010. When the day is 100 then you will have 00100. Is that what you want?

Posted: Fri Jan 06, 2006 8:34 pm

Yes....and that is what has me scratching my head going huh?

I would have thought so too....but it did not. The last image updates I had were for day 365.....then they stopped. One of members caught it and PMed me....I went looking....found that the output from the script called the day 5 instead of 005.

For the time being I have it fixed by simply adding 2, 0's in front of it. That will work through day 10 then I will have to kill 1 of the 0's.....then on day 100 I will have to kill the second. I would much rather just fix it....

The post above is accurate....I was careful about cut and pasting into this thread.....If you have any suggestions...I would love to hear them!

Thank You for your time!

Dawg

Posted: Fri Jan 06, 2006 10:55 pm

Try this instead.

Code:




#!/bin/bash





year=`date +%Y`


today=`date +%j`


day=$((today-1))





if [ "$day -lt 10" ]


then {


day=00$day


}


elif [ "$day -lt 100" ]


then {


day=0$day


}


fi





archive="/maps/mysite/data"


scriptdir="/maps/mysite/scripts"





cd ${archive}/workspace





wget -r -np -nd -A file.name http://site.name/level3/husf/site/${year}/${day}/1km/pass/intermediate/





wget -r -np -nd -A file.name http://site.name/level3/husf/site/${year}/${day}/1km/pass/intermediate/


exit 0

Posted: Mon Jan 09, 2006 8:49 pm

Hey Dawg! Did you ever try this?

Posted: Mon Jan 09, 2006 9:30 pm

LOL.....As bad as I hate to admit....No I have not. I will be on it tomorrow though. My...ah..."Patch" will only work till Jan 9.

Too much other stuff going on in the world...I am going to send you a link vie PM.

Dawg

Posted: Thu Jan 12, 2006 8:00 pm

OK....Raven.....I got it to work with a few adjustments. We had too many 0's in it...

Still have another bug I can not figure out. It started with the year rollover as well. IT is calling by default....2 days earlier instead of 1. (Instead of 011 for yesterday....it was returning 009)

I ran a date test and it returned correct....I checked the hardware time and the system time on the server and they are correct.

Sooo...I added a day to it...and it works as intended....but still makes no sence. Is there any place else I should check the time at?

#!/bin/bash
year=`date +%Y`
today=`date +%j`
day=$((today+1))
if [ "$day -lt 10" ]
then {
day=0$day
}
elif [ "$day -lt 100" ]
then {
day=$day
}
fi
archive="/maps/mysite/data"
scriptdir="/maps/mysite/scripts"

cd ${archive}/workspace

wget -r -np -nd -A theremotesite.sst.hdf http://theremotesite.edu/level3/husf/them/${year}/${day}/1km/pass/intermediate/

wget -r -np -nd -A theremotesite.chl.hdf http://theremotesite.edu/level3/husf/them/${year}/${day}/1km/pass/intermediate/

Here is some of the output....
Output from command /maps/xxxxxxxx/scripts/get_modis.sh 1> /dev/null ..

--20:52:14-- http://xxxxxxxxx.edu/level3/husf/xxxxx/2006/011/1km/pass/intermediate/
=> `index.html'
Resolving xxxxxxxx.edu... xxxxxxxxxx
Connecting to xxxxxxxxxx.edu[xxxxxxxxxx]:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 7,872 [text/html]