I want to automate my backup with crontab
steps followed
1) I created a shell (named expDB.sh,with chmod 777 permission)for taking backup.The content of shell is given below
/user2/oracle/bin/exp scott/tiger file=/usr/users/oracle/kan/emp.dmp tables=emp

2)45 6 * * * /usr/users/oracle/kan/exptest > /dev/null
3) i submitted the job by
crontab crontest
4) At 06.45 hrs cron job ran and given following error at /var/spool/mail/oracle
Message 206 not found; No message file for product=RDBMS, facility=EXP: Release - Production on Mon Oct 1 06:45:00 2001

(c) Copyright 2000 Oracle Corpor

Invalid format of Export utility name

Verify that ORACLE_HOME is properly set

Export terminated unsuccessfully

EXP-00000: Message 0 not found; No message file for product=RDBMS, facility=EXP

Cron: The previous message is the standard output
and standard error of the following crontab command:

/usr/users/oracle/kan/expt > /dev/null

(I tried the above steps with oracle user as well as with root user, the same error occured.I checked the .profile of oracle user for oracle home and is found to be ok)