/usr/bin/xterm -help

usage:  /usr/bin/xterm [-/+132] [-C] [-Sccn] [-T string] [-/+ah] [-/+ai]
    [-/+aw] [-b number] [-baudrate rate] [-/+bc] [-bcf milliseconds]
    [-bcn milliseconds] [-bd color] [-/+bdc] [-bg color] [-bw number] [-/+cb]
    [-cc classrange] [-/+cjk_width] [-class string] [-/+cm] [-/+cn] [-cr color]
    [-/+cu] [-/+dc] [-display displayname] [-e command args ...] [-fa pattern]
    [-fb fontname] [-/+fbb] [-/+fbx] [-fd pattern] [-fg color] [-fi fontname]
    [-fn fontname] [-fs size] [-/+fullscreen] [-fw fontname] [-fwb fontname]
    [-fx fontname] [%geom] [#geom] [-geometry geom] [-help] [-/+hm] [-/+hold]
    [-iconic] [-/+ie] [-/+im] [-into windowId] [-/+itc] [-/+j] [-/+k8]
    [-kt keyboardtype] [-/+l] [-/+lc] [-lcc path] [-leftbar] [-lf filename]
    [-/+ls] [-/+maximized] [-/+mb] [-mc milliseconds] [-/+mesg] [-/+mk_width]
    [-ms color] [-n string] [-name string] [-nb number] [-/+nul] [-/+pc]
    [-/+pob] [-report-colors] [-report-fonts] [-rightbar] [-/+rv] [-/+rvc]
    [-/+rw] [-/+s] [-/+samename] [-/+sb] [-selbg color] [-selfg color] [-/+sf]
    [-sh number] [-/+si] [-/+sk] [-sl number] [-/+sm] [-/+sp] [-/+t]
    [-ti termid] [-title string] [-tm string] [-tn name] [-/+u8] [-/+uc]
    [-/+ulc] [-/+ulit] [-/+ut] [-/+vb] [-version] [-/+wc] [-/+wf]
    [-xrm resourcestring] [-ziconbeep percent]




打ったコマンド
root@armadillo:~# startx firefox /usr/bin/xterm +fullscreen