How to pass a variable to the shell script and crontab?

Friends,
here is my script.....
exp userid=username/password@realdb file=/u02/logical_backup/abc_+$date+.dmp log=/u02/logical_backup/abc_+$date+.log owner=oraadmin statistics=none
i want the exported file name as abc_2101.dmp and abc_2101.log (2101 is a date and month)
I want to execute this script daily at 02:00 AM.
so that i edited the crontab -e as....
00 02 * * * ./u02/script/dailybkp.sh
Now what i want is....
1. is the steps are correct for crontab -e?
2. Is the script of the crontab will execute daily at 02:00 AM?
3. how can i rename the .log filename and .dmp file name daily according to the date. for example abc_2001 is today's date and month.how can i replace with the variable.
thanks
sathyguy

sorry....i tested with cp command it was working fine...
so, i thought it should work for exp command also.
but its not working....also its not throwing any error....
the crontab -e is having...
00 02 * * * exp userid=system/password@realdb file=/u02/test/n22.dmp log=/u02/test/n22.log owner=scott statistics=none
also i have tested by calling the script.
#!/bin/bash
00 02 * * * /u03/script/testbkp.sh
its not working
but the below one is working....
00 02 * * * cp /u02/test.txt /u02/test/test.txt
also this one is working....
#!/bin/bash
00 02 * * * /u03/script/testbkp.sh
i listed the chkconfig --list crond
crond 0,1,6 = off
2,3,4,5 are on
what might be the reason?
thanks
sathyguy

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