I still dont see where is the problem...
Here on aix 5.3:
vbe@ it34: /usr/tivoli/tsm/client/ba/bin> ll dsm.o*
-rw-r--r-- 1 root system 345 Jan 24 17:23 dsm.opt
-rw-r--r-- 1 root system 419 Jan 20 2005 dsm.opt.adsm2
-rw-r--r-- 1 root system 419 Jan 20 2005 dsm.opt.adsm3
-rw-r--r-- 1 root system 421 Jan 20 2005 dsm.opt.adsmsrv
-rw-r--r-- 1 root system 782 Nov 27 2006 dsm.opt.smp
vbe@ it34: /usr/tivoli/tsm/client/ba/bin> VAR1=`ll -ltr dsm.o*|tail -1`
vbe@ it34: /usr/tivoli/tsm/client/ba/bin> echo $VAR1
-rw-r--r-- 1 root system 345 Jan 24 17:23 dsm.opt
vbe@ it34: /usr/tivoli/tsm/client/ba/bin>