Show Column of File by cat + cut

Do test as following:

>dpkg-query -l > package.txt

>cat package.txt | cut -d " " -f3

=============
....
xserver-xorg-video-r128
xserver-xorg-video-radeon
xserver-xorg-video-radeonhd
xserver-xorg-video-rendition
xserver-xorg-video-s3
xterm
.....