Du solltest die Admin Namen in einem Array speichern, sprich sowas:
//Der Array
enum aInfo {
a_Name[MAX_PLAYER_NAME]
};
new Admin_Namen[][aInfo] = {
{"Kaliber"},
{"[NiCe]"}
};
//Der Code für den Command
ocmd:admins(playerid, params[])
{
#pragma unused params
new i, string[128], name[24], buffer[128], count, z;
for(; z<sizeof(Admin_Namen); z++)
{
for(; i<MAX_PLAYERS; i++)
{
if(!IsPlayerConnected(i)) continue;
GetPlayerName(i, name, 24);
if(!strcmp(Admin_Namen[z][a_Name], name))
{
count = z;
format(buffer, sizeof buffer,"%s {00FF00}[Online]\n",name);
strins(string, buffer, strlen(string), sizeof string);
}
}
if(!count)
{
format(buffer, sizeof buffer,"%s {FF0000}[Offline]\n",Admin_Namen[z][a_Name]);
strins(string, buffer, strlen(string), sizeof string);
}
}
ShowPlayerDialog(playerid,-1,DIALOG_STYLE_MSGBOX,"Adminliste",string,"Bestätigen","");
return 1;
}
Aus dem Kopf geschrieben, sollte aber gehen hoffe ich 
mfg. 
//Edit: Falls gerade noch jemand so einen Command sucht....
