== Command line parameters ==

This is a full list of the supported command line parameters. A number of
additional parameters are supported in addition to those present in the DOS
version.

=== General options ===

  -cdrom                              Save configuration data and 
                                      savegames in c:\heretic.cd, allowing 
                                      play from CD. (windows only) 

  -config <file>                      Load main configuration from the 
                                      specified file, instead of the 
                                      default.  

  -dumpsubstconfig <output filename>  Read all MIDI files from loaded WAD 
                                      files, dump an example substitution 
                                      music config file to the specified 
                                      filename and quit.  

  -episode <n>                        Start playing on episode n (1-4)  

  -extraconfig <file>                 Load additional configuration from 
                                      the specified file, instead of the 
                                      default.  

  -file <files>                       Load the specified PWAD files.  

  -iwad <file>                        Specify an IWAD file to use.  

  -loadgame <s>                       Load the game in savegame slot s.  

  -mb <mb>                            Specify the heap size, in MiB 
                                      (default 16).  

  -mmap                               Use the OS's virtual memory 
                                      subsystem to map WAD files directly 
                                      into memory.  

  -noartiskip                         Allow artifacts to be used when the 
                                      run key is held down.  

  -noblit                             Disable blitting the screen.  

  -nomonsters                         Disable monsters.  

  -nomusic                            Disable music.  

  -nosfx                              Disable sound effects.  

  -nosound                            Disable all sound output.  

  -ravpic                             Take screenshots when F1 is pressed. 
                                       

  -respawn                            Monsters respawn after being killed. 
                                       

  -servername <name>                  When starting a network server, 
                                      specify a name for the server.  

  -skill <skill>                      Set the game skill, 1-5 (1: easiest, 
                                      5: hardest). A skill of 0 disables 
                                      all monsters.  

  -warp <x> <y>                       Start a game immediately, warping to 
                                      level ExMy.  

  -zonescan                           Zone memory debugging flag. If set, 
                                      each time memory is freed, the zone 
                                      heap is scanned to look for 
                                      remaining pointers to the freed 
                                      block.  

  -zonezero                           Zone memory debugging flag. If set, 
                                      memory is zeroed after it is freed 
                                      to deliberately break any code that 
                                      attempts to use it after free.

=== Networking options ===

  -autojoin           Automatically search the local LAN for a multiplayer 
                      server and join it.  

  -connect <address>  Connect to a multiplayer server running on the given 
                      address.  

  -deathmatch         Start a deathmatch game.  

  -dup <n>            Reduce the resolution of the game by a factor of n, 
                      reducing the amount of network bandwidth needed.  

  -extratics <n>      Send n extra tics in every packet as insurance 
                      against dropped packets.  

  -ignoreversion      When running a netgame server, ignore version 
                      mismatches between the server and the client. Using 
                      this option may cause game desyncs to occur, or 
                      differences in protocol may mean the netgame will 
                      simply not function at all.  

  -newsync            Use new network client sync code rather than the 
                      classic sync code. This is currently disabled by 
                      default because it has some bugs.  

  -nodes <n>          Autostart the netgame when n nodes (clients) have 
                      joined the server.  

  -port <n>           Use the specified UDP port for communications, 
                      instead of the default (2342).  

  -privateserver      When running a server, don't register with the 
                      global master server. Implies -server.  

  -server             Start a multiplayer server, listening for 
                      connections.  

  -solo-net           Start the game playing as though in a netgame with a 
                      single player. This can also be used to play back 
                      single player netgame demos.  

  -timer <n>          For multiplayer games: exit each level after n 
                      minutes.

=== Dehacked and WAD merging ===

  -aa <files>        Equivalent to "-af <files> -as <files>".  

  -af <files>        Simulates the behavior of NWT's -af option, merging 
                     flats into the main IWAD directory. Multiple files 
                     may be specified.  

  -as <files>        Simulates the behavior of NWT's -as option, merging 
                     sprites into the main IWAD directory. Multiple files 
                     may be specified.  

  -deh <files>       Load the given dehacked patch(es)  

  -hhever <version>  Select the Heretic version number that was used to 
                     generate the HHE patch to be loaded. Patches for each 
                     of the Vanilla Heretic versions (1.0, 1.2, 1.3) can 
                     be loaded, but the correct version number must be 
                     specified.  

  -merge <files>     Simulates the behavior of deutex's -merge option, 
                     merging a PWAD into the main IWAD. Multiple files may 
                     be specified.  

  -nocheats          Ignore cheats in dehacked files.  

  -nwtmerge <files>  Simulates the behavior of NWT's -merge option. 
                     Multiple files may be specified.

=== Display options ===

  -1                   Don't scale up the screen.  

  -2                   Double up the screen to 2x its normal size.  

  -3                   Double up the screen to 3x its normal size.  

  -8in32               Set the color depth of the screen to 32 bits per 
                       pixel.  

  -bpp <bpp>           Specify the color depth of the screen, in bits per 
                       pixel.  

  -fullscreen          Run in fullscreen mode.  

  -geometry <WxY>[wf]  Specify the dimensions of the window or fullscreen 
                       mode. An optional letter of w or f appended to the 
                       dimensions selects windowed or fullscreen mode.  

  -grabmouse           Grab the mouse when running in windowed mode.  

  -height <y>          Specify the screen height, in pixels.  

  -nograbmouse         Don't grab the mouse when running in windowed mode. 
                        

  -nomouse             Disable the mouse.  

  -nonovert            Enable vertical mouse movement.  

  -novert              Disable vertical mouse movement.  

  -width <x>           Specify the screen width, in pixels.  

  -window              Run in a window.

=== Demo options ===

  -playdemo <demo>                  Play back the demo named demo.lmp.  

  -record <x>                       Record a demo named x.lmp.  

  -recordfrom <savenum> <demofile>  Record a demo, loading from the given 
                                    filename. Equivalent to -loadgame 
                                    <savenum> -record <demofile>.  

  -timedemo <demo>                  Play back the demo named demo.lmp, 
                                    determining the framerate of the 
                                    screen.

=== Compatibility ===

  -setmem <version>  Specify DOS version to emulate for NULL pointer 
                     dereference emulation. Supported versions are: 
                     dos622, dos71, dosbox. The default is to emulate DOS 
                     7.1 (Windows 98).

