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BZFS is the BZFlag server. To be lazy, the man page is located at [1]

The man page is pasted below for your convenience (it is in need of heavy wiki formatting).

Man Page


      bzfs  [-a linear angular] [-admsg message] [-advertise GROUPNAME,GROUP-
      NAME,...]  [-autoTeam] [-b]  [-badwords	badwordfile]  [-ban  ip{,ip}*]
      [-ban  ip[,ip]...]   [-banfile  filename]  [-c]	[-cache worldCacheURL]
      [-cacheout filename]  [-conf  configfile]  [-cr]  [-d]  [-density  num]
      [-disableBots]	   [+f	    {good|bad|team||flag-id}[{count}]]	   [-f
      {good|bad|flag-id}] [-fb] [-filterCallsigns] [-filterChat] [-filterSim-
      ple] [-g] [-groupdb file] [-h] [-handicap] [-help] [-helpmsg file name]
      [-i interface] [-j] [-lagdrop warn-count] [-lagwarn time/ms]  [-master-
      BanURL	       URL/s]	       [-maxidle	  time/s]	  [-mp
      ple-count],[observer-count]}]  [-mps  {max-score}]  [-ms  shots]  [-mts
      {max-score}] [-noMasterBanlist] [-p port] [-passdb file] [-passwd pass-
      word] [-pidfile filename] [-poll variable=value] [-printscore] [-public
      description] [-publicaddr address[:port]] [-publiclist url]  [-q]  [+r]
      [-rabbit  [score|killer|random]]  [-recbuf size] [-recbufonly] [-recdir
      directory]  [-replay]  [-reportfile  filename]  [-reportpipe   command]
      [-requireudp]  [+s  flag-count]	[-s flag-count] [-sa] [-sb] [-set name
      value] [-sl id num] [-spamtime time] [-spamwarn	warnLimit]  [-speedtol
      factor]	[-srvmsg  message]  [-st  time]  [-sw  count] [-synctime] [-t]
      [-tftimeout time-limit] [-time time-limit] [-timemanual]  [-tk]	[-tkkr
      percent] [-trackplayhistory] [-ts [micros]] [-userdb file] [-vars file]
      [-version] [-world world-file] [-worldsize world size]


      Bzfs is the server for BZFlag, and it must be running to play.  It  can
      be run on any system on the network (including a player's system or one
      without graphics).  Terminating	the  server  terminates  the  game  in


      -a linear angular

Sets the maximum linear and angular accelerations. The units are somewhat arbitrary so you'll have to experi- ment to find suitable values. Positive values will set limits to the acceleration and lower they are, greater is the inertia. Zero or negative values disable accel- eration limits.

      -admsg message Define a message which will be broadcast to all  players

every 15 minutes. This option can be used multiple times to define a multiline message.

      -advertise groupname,groupname,...

Allows control of who can see this server on the server list. Use: -advertise NONE to make a private server (no one will see the server, but global logins can be used). The default, if -advertise is not specified, is to allow everyone to see the server. Otherwise, your server will only be listed to members of the groups which you spec- when either -filterCallsigns or -filterChat is enabled.

      -ban ip{,ip}*  Prohibits connections  from  the	listed	IP  addresses.

Trailing 255 bytes are treated as mask bytes.

      -banfile filename

Specifies the name of a file where bzfs will store the banlist. It will load the banlist from this file when it starts (if the file exists), and write the banlist back to the file when someone gets banned or unbanned. If this option isn't given the banlist will not be saved.

      -c	      Enables the capture-the-flag style game. By default this

allocates one team flag per team. This can be modified see +f team. By default, the free-for-all style is used.

      -cache worldCacheURL

Specifies the URL for the world cache file. This is a binary file that clients will attempt to download before getting the world from the bzfs server.

      -cacheout filename

Save the currently specified world into a binary cache file and exit.

      -conf configfilename

Specifies the name of a configuration file to be used to set all of the bzfs options, rather than setting them on the command line.

      -cr	      Enables the capture-the-flag style game with random map.

You can optionally specify a building density by provid- ing a number (default is 5). One team flag per team is provided, but more can be added thru +f team. By default, the free-for-all style is used.

      -d	      Increase	debugging  level.  If  more  -d is given, more

debugging info is obtained.

      -density num   Specify density for buildings, i.e. the higher the inte-

ger number, the more buildings you will get. This applies to automatically generated maps only.

      -disableBots   Disallow clients from using the ROGER autopilot or  from

using robots.

      +f {good|bad|teamflag-id}[{count}]

Forces the existence of the given flag. If specified multiple times for the same flag-id, then that many flags will appear. The good argument is equivalent to specifying +f once for each kind of good flag. Same goes for the bad argument. The team argument adds a team be "+s40 -s50 -f G". Similarly, "+f good{40} +f bad{10} -f G{40}" would give you exactly 40 good flags except genocide and 10 of each bad flag.

      -fb	      Allow flags on box buildings.

Turn on the filtering of callsigns and email addresses. Callsigns and addresses are compared against bad words provided via -badwords.

      -filterChat    Turn  on	the filtering of chat messages.  Messages that

contain words listed via a -badwords file are replaced with !@#$%^&* characters.

      -filterSimple  By  default,  all filtering is aggressive, matching much

more than what is strictly listed in a -badwords file for convenience. Providing this option will make the -filterCallsigns and -filterChat comparisons exact match only.

      -g	      Quit after serving one game.
      -groupdb file  Load groups from file
      -h	      Buildings are given random heights.
      -handicap      Players  are  given  a handicap advantage based on their

ability in relation to the other players. Handicapped players will have faster tanks and shots. The handicap is determined by the player's score in relation to other players.

      -help	      Shows a help page and lists all the valid flag id's.
      -helpmsg file name

Create a help message accessible by /help name, which prints the contents of file. Restricted to 10 lines per help message.

      -i interface   Server  will  listen  for and respond to ``pings (sent

via broadcast) on the given interface. Clients use this to find active servers on the network. This is the TCP/UDP/IP address the server will listen on.

      -j	      Allows jumping.
      -lagdrop warn-count

Kicks players after warn-count lag warnings.

      -lagwarn time/ms

Send warnings to players that lag more than time. A single value sets the total number of players allowed. Five comma separated values set the maximum for each team. If a count is left blank then no limit is set for that team, except for the limit on the total number of players. Both forms may be provided.

      -mps max-score Sets a maximum score for individual players.  The  first

player to reach this score is declared the winner and the game is over.

      -ms shots      Allows up to shots simultaneous shots for  each  player.

This is 1 by default.

      -mts max-score Sets a maximum score for teams.  The first team to reach

this score is declared the winner and the game is over.


Server will not attempt to load the master ban list from the internet.

      -p port	      Listen for game  connections  on	port  instead  of  the

default port. Use -help to print the default port, or use -d debug printing.

      -passdb file   Load passwords from file
      -passwd password

Specify a server administrator password for use in remote administration such as /kick, /ban, /mute, etc messages.

      -pidfile filename

Specify a file where the server will write its process ID so it may be used for remote administration.

      -poll variable=value

Configure several aspects of the in-game polling system

banTime default number of minutes player should be banned (unspecified, the default is 300)

vetoTime max seconds authorized user has to abort poll (default is 20)

votePercentage percentage of players required to affirm a poll (unspecified, the default is 50.1%)

voteRepeatTime minimum seconds required before a player may description. By default, a server will respond to broadcast queries, allowing clients to find servers run- ning on the standard port on the local subnet. The -public option causes the server to register itself with a list server, which clients can query to get a list of bzfs servers.

      -publicaddr address[:port]

Advertise this server with the given address and port. Only has an effect when used with -public. Normally a server advertises itself at the local address and port. Some servers are not accessible from the internet at this address (for example servers behind a firewall using Network Address Translation). Use this option to specify the address and/or port that internet users should use to access this server.

      -publiclist url

Advertise this server on the list servers listed at url. Only has an effect when used with -public. A built-in url is used by default. The BZFlag clients use the same built-in url so, by default, clients will see public servers automatically. This argument may be provided multiple times to publicize a server to multiple list servers.

      -q	      If specified, the server will not listen for nor respond

to ``pings. BZFlag sends out these pings to give the user a list of available servers. This effectively makes the server private, especially if the -p option is also used.

      +r	      Makes most shots ricochet.  Super bullets, shock	waves,

and guided missiles do not.

      -rabbit [score|killer|random]

Enables the rabbit-hunt style game. By default, the free-for-all style is used. You must specify the algo- rithm used to pick a new rabbit when the old one dies. The score algorithm uses a modified wins/(wins+losses) score and picks the top scoring player to be the new rabbit. The killer algorithm specifies a reverse tag game where whomever kills the rabbit becomes the new rabbit. The random algorithm randomly picks a new rab- bit without regard to score. (The score algorithm is the original behavior.)

      -recbuf size   Start with the recording buffer active, with the	speci-

fied size (in megabytes).

      -recbufonly    Disable recording straight to files


      -requireudp    Require clients to use parallel  UDP.  If  players  fire

before opening a UDP channel, kick them off the server.

      +s num-flags   The server will have an  extra  num-flags  random  super

flags available at all times. The -f option can be used to restrict which types of flags will be added. Required flags given by the +f option are not included in the num-flags total.

      -s num-flags   The server will have up to num-flags random super  flags

available at any time. The -f option can be used to restrict which types of flags will be added. Required flags given by the +f option are not included in the num-flags total.

      -sa	      Antidote flags are provided for players with bad	flags.
      -sb	      Allow spawns on box buildings.
      -set name value

Set BZDB variable name to value

      -sl id num     Restrict flag id to num shots.
      -spamtime time Minimum  


      -spamwarn warnLimit

Number of warnings a player/spammer gets, who violates -spamtime.

      -speedtol factor

Override the default speed auto kick factor. The factor should not be less then 1.0. The factor is a multiplier.

      -srvmsg message

Define a server welcome message. This option can be used multiple times to define a multiline message.

      -st time       Bad flags are automatically dropped after time  seconds.
      -sw count      Bad  flags  are  automatically dropped after count wins.

Capturing a team flag does not count as a win.

      -synctime      Forces all clients to use the same  time	of  day.   The

current time is determined by the server's clock. This disables the + and - keys on the clients.

      -t	      Adds teleporters to the game.

first player joins. With -timemanual, the countdown has to be started manually using the /countdown command. This is useful for matches.

      -tk	      Changes the default behavior where a player dies when he

kills a teammate. When using this option, he will just get a -1 score penalty for the kill but not be killed in game.

      -tkkr percent  Kicks players whose team killing to normal kill ratio is

greater than percent [1-100]. A start up grace period is given to players.


Has the server track players with good runs of kills and anounces them. Also anounces those players that stop the runs of good players.

      -ts [micros]   Include  timestamp  information in DEBUG output - useful

for logging. If micros is specified, microseconds will be added to the timestamp.

      -userdb file   Load group associations from file
      -vars file     Loads  values for game configurable variables from file.

Entries are one per line in the form: set variable value. For a list of variables that are configurable, in the BZFlag client, send a message with /set as the text.

      -version       Prints the version number of the executable.
      -world world-file

Reads a specific BZFlag .bzw world layout file for the game map.

      -worldsize world-size

Changes the size for random maps

      The server uses nearly zero CPU time when nobody is playing,  and  even
      during  a game the server uses very little CPU, so it's not a burden on
      the system to leave one running and it won't interfere  with  a	player
      using the same system (except on Windows 95, which really sucks at mul-
      titasking).  The server will continue to run until  terminated.	 If  a
      game  is  in  progress  when  the server goes down, all players will be
      kicked off and the game will be aborted without	warning.   The	server
      resets  itself  when  all  players have quit.  All players must quit to
      reset the server when a game is	over  (because	of  a  score  or  time
      The following game styles are recommended starting points.
      games  where  lag/jitter can cause unfair advantage.  Single shot, non-
      Jump games will teach valuable lessons in  dodging,  however,  and  are
      excellent starting points for the beginner.
      Communication  between  the  server  and clients (i.e. between bzfs and
      bzflag) during a game is via TCP and UDP.  Use the -help option to  get
      the  server's  default  port.  If there's a firewall between the server
      and client, the firewall must accept connections  from  the  client  to
      this port and forward them to the server.
      Clients	can  search for servers by sending broadcast UDP packets.  But
      they must be on the same local area network for this to work.   Clients
      can  also  find	servers  advertised  using  -public  by  querying list
      Game information is relayed  through  the  server.  Some  communication
      between	clients, such as position and orientation information, is nor-
      mally sent via UDP packets.  Other data, like flag grab and  kill  mes-
      sages, are sent to the server via TCP. The server then turns around and
      broadcasts these packets  to all players. Since being in a game implies
      connection  to  the  server, all players are guaranteed to get all mes-
      sages sent via TCP.  But the UDP packets may be	discarded.   If  other
      players	can see your tank in the game but it never appears to move and
      shots go through it, chances are high that your UDP connection  is  not



Lists network delays, jitter and number of lost resp. out of order packets by player. Example: MrApathyCream 335 +- 10ms Gerbol 210 +- 3ms captain_macgyver 155 +- 0ms 12% lost/ooo


Displays the idle time in seconds for each player. A player is idle when he is dead and has not respawned yet.

MrApathyCream: 0s Gerbol: 80s captain_macgyver: 13s


Lists what flags players have grabbed in the past. Example: MrApathyCream: (<-) (->) (O) (CB) (M) (B) (JM) (WA) Gerbol: (L) (GM) (L) (GM) (CL) (ST) (GM) (L) captain_macgyver: (SB) (SW)

      /clientquery [callsign]

Retrieve client version info from all users, or just CALLSIGN if given Example: /clientquery MrApathyCream MrApathyCream: Version: BZFlag 1.11.6-20040729-gnu-linux-SDL

      /report {message}

Write a message to the server administrator. Example: /report I like this map!

      /part {message}

Leave the server with a goodbye message (similar to IRC's /part) /part Gotta go! bye everyone!

      /quit {message}

Quit the game with a goodbye message (similar to IRC's /quit) /quit Gotta go! bye everyone!


This command displays an "action" that is conveyed to another player. It allows for a little more expressivity in the game. For example: "/me is hunting wabbits" turns into a message like "TimRiker is hunting wabbits" that gets displayed differently to other players.

      /msg some player some message

This command allows a player to send a message to another player. Similar to using the "," and "." message keys in the game and then selecting your recipient, this will send some message to particular player. The quotes are optional.



View the server's report file.

      /record list

List all files in the recordings directory

      /record start

Start recording into the memory buffer

      /record stop
      /record file <filename>

Start recording directly to a file

      /record save <filename> [seconds]

Save the recording buffer into a file. If seconds is specified, then only save that many previous seconds into the file.

      /replay list

List all files in the recordings directory

      /replay load <filename|#index>

Load the specified recording file by name, or by index (same indices as produced by the 'replay list' command)

      /replay play

Start playing the recording. This will oftentimes require that all players connected to the server rejoin (to reload the map, etc...)

      /replay loop

Start looping the recording. This will oftentimes require that all players connected to the server rejoin (to reload the map, etc...)

      /replay skip [+/- seconds]

If seconds is specified, then skip that amount of time in the recording. Otherwise, skip forwards until there is activity. /replay stats Show the current replay status (filename, posi- tion, etc...)


Stop serving BZFlag on this server


Kick all players off the server


Ends the current game

      /flag reset {unused}

Repositions flags. If unused is specified, flags carried by tanks are not affected.

      /flag up

Removes all flags from the game

      /flag show

Shows all flags with information. Example: 0: p:-1 r:1 g:1 1:V s:1 p:159.1x43.2x0.0 A reason is required

      /kill <"Player name" | playerName | #slot> [reason]>

Kill a player just like when shooting.

Example: /kill Gerbol kill the player named Gerbol /kill #4 teamkilling Kill the player using slot 4 because teamkilling


List player names and IP addresses. Example: /playerlist [0]MrApathyCream: udp id [1]Gerbol: udp id [2]captain_macgyver: udp id

      /ban <ip | ipList | #slot | Player name | playerName > <duration> <reason>

Ban players using the specified IPs for certain length of time from using this server. <duration> can be: 'short' or 'default' for the default ban time 'forever' or 'max' for infinite bans a time in the format <weeks>W<days>D<hours>H<minutes>M just a number of minutes

Examples: /ban 2 cheating bans player with specific ip for 2 minutes /ban 35.23.*.*,47.23.17.* 0 Cheaters bans all ips in this range forever /ban 2h30m "ShootMe" was abusing players bans specific ip for 2.5 hours with given reason /ban #5 60m Rejoining bans player using slot 5 for 60 minutes with given reason /ban "Tanker" max cheating bans the player Tanker forever because cheating

Note: Slots numbers are only displayed in admins clients. Duration and reason are required.


List all of the IPs currently banned from this server. Example: /banlist IP Ban List ------------


List all of the host patterns currently banned from this server.

      /say {message}

Generate a public message sent by the server. Example:

/say This is a servermessage

      /sendhelp <"Player name" | playerName | #slot> <help page>

Send the specified help page to a user

/send register "Foo" Send the the help page 'register' to the player Foo

      /countdown [seconds]

Starts the countdown sequence for a timed game. The countdown sequence length can optionally be specified in seconds. Examples:

/countdown /countdown 3


Dynamic change the maximum allowed lag time. Example:

/lagwarn 300


      Generally, you start with empty files for the user and  password  data-
      bases.	These  are  maintained	by  the server, and modifiable through
      server commands.  Users in turn belong to groups.  Groups are generally
      customized to perhaps allow administrative control to trusted users.
      There  are both local and global groups, i.e. groups that are available
      across the entire BZFlag network.  In setting up a server, you may want
      to specify global groups that will allow already well known and trusted
      users to police your server and help maintain control against  cheaters
      and abuse.
      The  server will automatically create three groups: EVERYONE, VERIFIED,
      The  LOCAL.ADMIN group has almost every permission possible (similar to
      granting admin powers via /password).

      A  group  database  file  is  set  up to contain the specific local and
      global groups you care to have on your server in  addition  to  default
      groups  and exactly which permissions are granted by each.  These files
      are laid out with one line per group, using the following format:
      GROUP_NAME: [*Group] [+|-|!]perm1 [+|-|!]perm2 ... permN

      *Group: inhert permissions from existing group "Group"
      +perm: add perm to this group
      -perm: remove perm from this group
      !perm: forbid perm for this group. makes perm inaccessable whether it's
      granted from another group or not
      If  no  operator is given with a permission it is handled like +perm. A
      group line for a previously existing group adds to already granted per-
      missions.  That	way  you  can spread a group's definition over several
      GROUP_NAME: +perm1 +perm2
      GROUP_NAME: +perm3 +perm4 -perm5
      Group names cannot have spaces, quotes, or other special characters  in
      them.  This would be a sample line defining a "cop" group:
      Now  a  group  USERADMIN with all permissions granted to COPS plus some
      additional could look like this:
      Probably you want to define  customized	permissions  for  the  default
      group "VERIFIED" instead of those automatically asigned by the server:
      VERIFIED: -ALL +perm1 +perm2 ...
      Or you want to disable the /poll command entirely?
      To  distinguish	between  a group that is local and one that is global,
      use the "LOCAL." prefix as part of the group name, e.g.:

      The available permissions are as follows:
      KICK		   /kick
      LAGSTATS 	   /lagstats
      LAGWARN		   /lagwarn
      LISTPERMS	   not implemented
      MUTE		   /mute
      PLAYERLIST	   /playerlist
      POLL		   /poll
      POLLBAN		   /poll ban
      POLLFLAGRESET	   /poll flagreset
      POLLKICK 	   /poll kick
      POLLSET		   /poll set
      PRIVATEMESSAGE	   /msg
      REJOIN		   allows instant rejoin, regardless of _rejoinTime
      REMOVEPERMS	   /removegroup
      REQUIREIDENTIFY	   user must /identify when using this locally	regis-
      tered callsign
      SAY		   /say
      SETALL		   use of all set/remove commands
      SETPERMS 	   /setgroup
      SETPASSWORD	   not implemented
      SETVAR		   /set /reset
      SHOWOTHERS	   not implemented
      SHUTDOWNSERVER	   /shutdownserver
      SPAWN		   join  game  as  a player. observers don't need this
      SUPERKILL	   /superkill
      TALK    allows all players to send messages
      UNBAN		   /unban /hostunban
      UNMUTE		   /unmute
      VETO		   /veto
      VOTE		   /vote

      /register {password}

Register your current callsign to the specified password. Pass- words must be at least 3 characters long, and the callsign may not contain quotes or other non-alphanumeric/space characters

      /identify {password}

Log in to a registered callsign

      /setpass {password}

Changes your password

      /ghost {callsign} {password}

Lists the groups that a registered user is a member of

      /setgroup {callsign} {group}

Add a user to a group

      /removegroup {callsign} {group}

Remove a user from a group


Reloads the user, group, and password files (for synchronization between multiple servers on the same machine)

      /deregister [callsign]

With an argument, it deregisters another user's callsign. With- out, it removes your own registration.

      /poll ban|kick|vote|veto [...]

Interact and make requests of the bzflag voting system via the /poll command. The ban and kick subcommands request a vote to respectively ban or kick some player. The playername is expected as the next argument. The vote and veto commands behave identical to the /vote and /veto command counterparts, expecting the same arguments in following. By default, you must be registered to request and vote on a poll.

      /vote yes|no

If there is a poll active, this command will place a vote in favor or in opposition to the poll. Multiple languages are sup- ported as a vote argument in addition to "yes" and "no". By default, you must be registered to vote on a poll.

      /veto	If  there  is  a  poll	active, this will cancel the poll.  By

default, you must be an admin to veto a poll.

      /masterban flush|reload

Forces the server to flush any bans from the master server. If

Allows a server admin to restore the TALK permission to a previ- ously muted player. usage: /unmute <#slot> | <playername>


      BZFlag worlds come in two varieties, randomly generated ones, and human
      designed ones. By default, bzfs uses randomly  generated  world	unless
      you  specify  the -world command line or configuration file option. The
      world file specified by the -world option is a  text  based  file  that
      contains  a  list of world objects. This file can be created using pro-
      grams found on through cvs, or can be hand edited.  See
      the bzw(5) manual page for more details.


      bzflag(6), bzadmin(6), bzw(5)

bzfs-2.0.4 2006-04-17 bzfs(6)