Heres my what my Terminal does:
[root@localhost ~]# prboom -iwad /usr/share/doom/doom1.wad
prboom v2.4.1 (
http://prboom.sourceforge.net/)
found /usr/share/doom/doom1.wad
IWAD found: /usr/share/doom/doom1.wad
Unknown Game Version, may not work
PrBoom (built Apr 22 2006), playing: Public DOOM
PrBoom is released under the GNU General Public license v2.0.
You are welcome to redistribute it under certain conditions.
It comes with ABSOLUTELY NO WARRANTY. See the file COPYING for details.
M_LoadDefaults: Load system defaults.
default file: /root/.prboom/prboom.cfg
I_SetRes: Using resolution 320x200
V_Init: allocate screens.
found /usr/share/doom/prboom.wad
D_InitNetGame: Checking for network game.
W_Init: Init WADfiles.
adding /usr/share/doom/doom1.wad
I_Read: read failed: EOF