aaa_skel-2006.5.19-0.2.i586.rpm
aaa_skel.rpm -> aaa_skel-2006.5.19-0.2.i586.rpm
art-sharp2-2.8.2-15.1.i586.rpm
art-sharp2.rpm -> art-sharp2-2.8.2-15.1.i586.rpm
avahi-0.6.5-29.3.i586.rpm
avahi.rpm -> avahi-0.6.5-29.3.i586.rpm
bash-3.1-24.3.i586.rpm
bash.rpm -> bash-3.1-24.3.i586.rpm

for i in *.rpm; do echo ${i%-*}; done

aaa_skel-2006.5.19
aaa_skel.rpm
art-sharp2-2.8.2
art
avahi-0.6.5
avahi.rpm
bash-3.1
bash.rpm

Target = 

aaa_skel
art
avahi
bash