Complete list of all Quake console commands:

 god              - god mode ON/OFF
 give 2           - weapon 2 available
 give 3           - weapon 3 available
 give 4           - weapon 4 available
 give 5           - weapon 5 available
 give 6           - weapon 6 available
 give 7           - weapon 7 available
 give 8           - weapon 8 available (also in shareware version !)
 give s 255       - 255 items shotgun ammo
 give c 255       - batteries will be charged
 give r 255       - 255 rockets
 give n 255       - 255 nails
 give h 999       - health will be set to 999
 impulse 9        - all weapons and keys
 impulse 11       - 1 juwel available, can be repeated four times
 impulse 255      - quad damage
 fly              - fly mode ON/OFF
 r_fullbright x   - lights on
 noclip           - clipping OFF
 map ExMy         - jump to episode x map y
 notarget         - invisibility
 map start        - jump to start
 map end          - jump to level end boss
 name <name>      - change player name
 status           - information about the current situation
 crosshair x      - crosshair ON/OFF
 registered x     - simulate reg. version in the shareware version
 help             - help menu
 clear            - clear console window
 echo <text>      - text will be displayed on the screen
 screenshot       - PCX dump
 save <filename>  - save as
 load <filename>  - load
 kill             - player dies and restarts the level
 timerefresh      - frames per second
 showturtle x     - if the frame rate is blow 10 a turtle will be
                    displayed
 version          - version number
 sv_friction #    - changes friction (4)
 sv_gravity #     - changes gravity (800)
 sv_maxspeed #    - max speed (800)
 sv_idlescale #   - change idle scale (0)
 r_drawentities x - all objects ON/OFF
 r_drawflat x     - all textures ON/OFF
 r_waterwarp x    - underwater effects
 fov #            - change view (90)
 d_mipscale #     - change mip scale (1)
 nosound x        - sound ON/OFF
 vid_describemode #
                  - informations about mode #
 vid_describemodes
                  - shows all graphic modes
 vid_describecurrentmode
                  - informationen about current graphic mode
 vid_mode #       - changes graphic mode
 vid_nopageflip x - page flipping ON/OFF
 vid_nummodes     - # of modes
 vid_testmode #   - 5 sec graphic mode test
 vid_wait         - sets wait mode

 demos            - plays the built-in demos
 playdemo <name>  - plays an own demo
 record <name>    - records a demo
 stop             - stopps the recording of a demo

 cd eject         - ejects CD
 cd loop <track>  - endless loop of track #
 cd off           - CD OFF
 cd on            - CD ON
 cd play <track>  - plays track #
 cd remap <track1> <track2>
                  - reconfigures the numbers of the tracks
 cd reset         - reloads the CD
 cd stop          - stopps CD
 cd resume        - resume CD

 menu_keys        - open keys menu
 menu_save        - open save menu
 menu_net         - open multiplayer menu
 menu_main        - open main menu
 menu_options     - open options
 menu_load        - open load menu
 say              - message to all players
 say_team         - message to team players
 color <Shirt> <Pans>
                  - changes color of clothes
 com#             - information about COM #
 connect <server> - connects with server, also COM #
 disconnect       - disconnects form server
 maxplayers       - max # of players
 hostname         - change host name
 net_stats        - network stats
 slist            - list of all server
 ping             - speed of network

 soundinfo        - sound info
 stopsounds x     - all sounds ON/OFF
 volume #         - sound volume
 sbinfo           - information about sound card
 bgmvolume #      - music volume
 bgmbuffer #      - sound buffer
 snd_show x       - sound debugger
 cl_rollspeed #   - strafe speed
 cl_rollangle #   - sidestep angle
 v_kicktime #     - kicktime
 v_kickroll #     - kicktime strenght
 v_kickpitch #    - kicktime strenght with hit
 r_drawentities x - show items
 r_drawviewmodel x
                  - show weapons?
 r_draworder x    - transparent walls
 r_dspeeds        - stats
 r_maxedges #     - max # edges
 r_polymodelstats - stats
 r_speeds         - stats
 r_timegraph      - show graph
 sv_nostep x      - player can't walk over streps
 sv_maxvelocity # - max ammo speed
 d_mipscale x     - fuzzy
 d_subdiv16 x     - perspective calculated only all 16 pix
 m_pitch #        - up-down sensitivity
 m_yaw #          - turn around sensitivity

 sizeup           - enlarge screen
 sizedown         - small screen
 bf               - redraw
 centerview       - center view
 viewsize #       - change view size
 showram x        - RAM symbol ON/OFF
 showpause x      - pause symbol ON/OF
 lookspring x     - center view after mouse lock ON/OFF
 joybuttons #     - buttons of joypad
 bind <key> <command>
                  - set key to a certain command, e.g.
                    BIND W "IMPULSE 9"
 alias <cmd> <cmd>
                  - combine commands
 sensitivity #    - change mouse sensitivity
 scr_conspeed #   - change console speed
 scr_ofsx         - current x position
 scr_ofsy         - current y position
 scr_ofsz         - current z position

 pause            - pause the game
 togglemenu       - console ON/OFF
 unbindall        - erases all combinations
 profile          - stats
 edictcount       - stats
 entities         - stats

Comments:

 If x is a 1 so the feature will be enabled, if it is 0 the feature
 will be deactivated. For # there can be any number.