tar problem

my directory contains more than 3000 files. I don't want save all of them but when I perform tar command like

tar cvf /dev/rmt0 *.dat

tar exit with too many argument

I try to divide file into separated command:
tar cvf /dev/rmt0 a*.dat        
tar uvf /dev/rmt0 b*.dat        
 ... etc

but save perfomance where loss.

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The problem is that the unix command shell pre-expands an argument like "*.dat" before passing it to the tar command.  So tar is "seeing" a command like:

tar cvf /dev/rmt0 a.dat b.dat c.dat.......

etc. for all 3000 files and it's choking on it.  One option would be to use the -T option that would read the list of files to backup from a file.  So you could do:

ls *.dat >/tmp/BACKUP_FILES
tar cvf /dev/rmt0 -T /tmp/BACKUP_FILES

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