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You need to set the full path to sqlplus in the script.

find /path/to/directory -ctime <integer-number-of-days-from-today> -type f |xargs rm
e.g. today is May 16 and May 12 is the target day (4 days ago) and my files are in folder mydir

cd mydir
find...

Multiple users with same UID is not possible. However, you could add multiple users to a particular group and change the permissions accordingly.
man group should give you a better idea.

You...

Also (a db connection might be expensive or you may not have mysql on your system), another possibility is:
mysql -u <username> -p<password> -e "SELECT WEEK('2012-04-04');"

date --date=20120404 +%W

If bash script weren't a stringent requirement, I would suggest python, perl or php. Python has a package called BeautifulSoup to do exactly this... (you will need to also import urllib for fetching...