I'm confused. Can someone give me a brief description of the difference
in these three methods of backing up the control file in RMAN:

1.
copy current controlfile to
'/u01/app/oracle/admin/BUTEST/exp/$ctl_name';

2.
backup current controlfile;

3.
sql "alter database backup controlfile to ''control1.bak'' reuse";
catalog controlfilecopy 'control1.bak';

Thanks,
Dan Straub
McKesson Information Solutions
541-681-8278
44°03'N 124°55'W
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