SA:MP DEFAULT COMMANDS.
San Andreas Multiplayer has some commands that are used on every server, no matter the server's script. I don't know if all of you guys know them, so there we go.
/quit OR /q - This command is used to shut your game more quickly than quitting it from the game's menu.
/headmove - This command is used when you want to enable/disable player head's movement.
/timestamp - Adds the time on your chat.
/dl - Reveals information regarding vehicles (E.g health, model etc.)
/save - Saves the current position coordinates in your Documents\GTA San Andreas User Files\SAMP as savedpositions.txt
/rs - Raw Save (/rs) is like the command above (/save), but the difference is that this command only saves your position and the facing angle in a text document named rawpositions.txd and can be found in Documents\GTA San Andreas User Files\SAMP.
/interior - This command is used when you want to see what's the interior's ID you're currently in.
/pagesize (10-20) - Select how many lines of text you want your chatbox to show.
/fpslimit (20-100) - This command sets the limit of FPS. The higher the limit the smoother your game is.
/mem - Shows the current amount of memory usage.
/nametagstatus - This is a command which has been added in the current version (0.3X). When you have this command enabled (by default it is) shows you a small hourglass under the player's name which means that player is AFK or when his game is minimized, or he paused it (ESC), lost connection to the server (crashed or timed out) and also when he is taking screenshots which freezes the game for over 3 seconds.
Credits are going to the San Andreas Multiplayer wikipage; http://wiki.sa-mp.com/wiki/Client_Commands