Actually:
jak@jak-x230:~/Downloads$ ls *.deb AdbeRdr9.5.5-1_i386linux_enu.deb debhelper_9.20160115ubuntu3_all.deb jak@jak-x230:~/Downloads$ _filedir "deb" jak@jak-x230:~/Downloads$ echo $_ deb jak@jak-x230:~/Downloads$ _filedir "*.deb" jak@jak-x230:~/Downloads$ echo $_ AdbeRdr9.5.5-1_i386linux_enu.deb debhelper_9.20160115ubuntu3_all.deb
So, it seems you are wrong.
Actually:
jak@jak- x230:~/ Downloads$ ls *.deb 5.5-1_i386linux _enu.deb debhelper_ 9.20160115ubunt u3_all. deb x230:~/ Downloads$ _filedir "deb" x230:~/ Downloads$ echo $_ x230:~/ Downloads$ _filedir "*.deb" x230:~/ Downloads$ echo $_ 5.5-1_i386linux _enu.deb debhelper_ 9.20160115ubunt u3_all. deb
AdbeRdr9.
jak@jak-
jak@jak-
deb
jak@jak-
jak@jak-
AdbeRdr9.
So, it seems you are wrong.