Here’s the list of other command-line parameters. Note that you can use any available cheat code as a command-line
parameter… just put “-” in front of it:

-console —Enables Console (you can do this in the options dialog box of the key layout setup
-god —God mode (server side only)
-give <item or weapon name> —Gives a weapon or an item (see the list below)
-buddha —Reduces your health
-hurtme # —Hurts the player (# is damage amount)
-impulse 101 —All weapons
-impulse 82 —Spawns a jeep
-notarget —Player becomes hidden to NPCs
-noclip —Walk through walls (server side only)
-maps —Displays map list
-map <map name> —Load a specified map (see the list below)
-developer # —Sets developer mode to on/off/verbose (0-off, 1-on, 2-verbose)
-mlook —Enables mouse look
-hud_quickhelp/text? —1 Shows crosshair
-viewmodel_fov # —Sets the size of the weapon you’re carrying (54 is default)
-exec <filename> —Execute a script file
-cl_drawhud 1 —Turns hud display on
-cl_enablehud 1 —Turns hud display on
-cl_showfps 1 —Shows frames per second in game
-npc_create —Creates an NPC (works in worlds that have an NPC entity)
-npc_create_aimed —Creates an NPC aiming away from the player.
-picker —Toggles ‘picker’ mode.
-setpos —Move player to specified origin (must have sv_cheats 1 enabled).
-setang —Snap player eyes to specified pitch yaw (musthave sv_cheats).
-sv_gravity # —Set gravity to #
-sv_stopspeed # —Set minimum stopping speed when on ground to #
-sv_friction # —Sets world friction to #
-sv_bounce # —Sets bounce multiplier for physically simulated objects collision
-sv_maxvelocity # —Sets the maximum velocity of any moving object to #
-sv_waterdist # —Sets vertical view fixup when eyes are near water plane to #
-air_density # —Changes the density of air to #
-dsp_explosion_effect_duration # —Sets length of confusion/ear-ringing effect to #
-prop_debug —Toggle bounding-boxes debug mode on/off (red – ignore damage, white – respond to damage, green – health)
-sv_soundemitter_filecheck —Toggle reporting missing .wav files for sounds
-mat_numtextureunits # —Limits the number of texture units to # (0 – let the game decide how many texture units to use)
-mat_yuv 0
-r_anamorphic 0
-netgraph 3 —Graph connection throughput in multi-player; 0 is off, 3 is most detailed
-mat_preloadshaders
-preload
-dx9
-fullscreen
-width 1024 -height 768 —Specify screen width during game play
-heapsize 80000
-dxlevel 90
-shaderdll shader_nvfx_ps20.dll
-mouselook
-dx8
-condebug —Add debug messages to ingame console
-sw —Software rendering mode
-startwindowed —Run in window
-window —Run in window
-windowed —Run in window