/rcon [PASSWORD] pb_sv_getss [PB_PLAYER_ID]
It's not the !listplayers ID btw. And the PNG screenshot will be uaot saved into the FTP file.
Added (2009-12-03, 5:58 Pm)
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Update: I enabled all Users to see the Players PB ID.
Open console, then type: /pb_plist , then take the ID into the PB_sv_GetSS.