diff --git a/src/fr/pandacube/java/util/commands/AbstractCommand.java b/src/fr/pandacube/java/util/commands/AbstractCommand.java
new file mode 100644
index 0000000..1db6eaa
--- /dev/null
+++ b/src/fr/pandacube/java/util/commands/AbstractCommand.java
@@ -0,0 +1,141 @@
+package fr.pandacube.java.util.commands;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.logging.Logger;
+
+public class AbstractCommand {
+	
+	public final String commandName;
+	
+	public AbstractCommand(String cmdName) {
+		commandName = cmdName;
+	}
+	
+
+	/**
+	 * <p>
+	 * Concatène les chaines de caractères passés dans <code>args</code> (avec
+	 * <code>" "</code> comme séparateur), en ommettant
+	 * celles qui se trouvent avant <code>index</code>.<br/>
+	 * Par exemple :
+	 * </p>
+	 * <code>
+	 * getLastParams(new String[] {"test", "bouya", "chaka", "bukkit"}, 1);
+	 * </code>
+	 * <p>
+	 * retournera la chaine "bouya chaka bukkit"
+	 * 
+	 * @param args liste des arguments d'une commandes.<br/>
+	 *        Le premier élément est l'argument qui suit le nom de la commande.
+	 *        Usuellement, ce paramètre correspond au paramètre
+	 *        <code>args</code> de la méthode onCommand
+	 * @param index
+	 * @return
+	 */
+	public static String getLastParams(String[] args, int index) {
+		if (index < 0 || index >= args.length) return null;
+		return String.join(" ", Arrays.copyOfRange(args, index, args.length));
+	}
+
+	/**
+	 * <i>Prends en charge les tokens avec des espaces, mais retourne les
+	 * propositions complètes</i>
+	 * 
+	 * @param token
+	 * @param allProposal
+	 * @return
+	 */
+	public static List<String> getTabProposalFromToken(String token, Collection<String> allProposal) {
+		List<String> ret = new ArrayList<String>();
+
+		for (String s : allProposal)
+			if (s.toLowerCase().startsWith(token.toLowerCase())) ret.add(s);
+
+		if (ret.isEmpty()) ret.addAll(allProposal);
+		
+		ret.sort(null); // String implents Comparable
+
+		return ret;
+	}
+	
+	
+	
+	public static final TabProposal TAB_NO_PROPOSAL = () -> Collections.emptyList();
+
+	public static TabProposal TAB_PROPOSAL(Collection<String> proposals) { 
+		return () -> proposals;
+	}
+	
+	public static TabProposal TAB_INTEGERS(int startIncluded, int endIncluded) {
+		List<String> proposals = new ArrayList<>(endIncluded - startIncluded + 1);
+		for (int i = startIncluded; i <= endIncluded; i++) {
+			proposals.add(Integer.toString(i));
+		}
+		return () -> proposals;
+	}
+	
+	public static TabProposal TAB_PROPOSAL_LAST_PARAMS(String[] args, int index, Collection<String> proposals) { 
+		String lastParamToken = getLastParams(args, index);
+		String[] splittedToken = lastParamToken.split(" ", -1);	
+		int currentTokenPosition = splittedToken.length - 1;
+		String[] previousTokens = Arrays.copyOf(splittedToken, currentTokenPosition);
+		
+		List<String> currentTokenProposal = new ArrayList<>();
+		for (String p : proposals) {
+			String[] splittedProposal = p.split(" ", -1);
+			if (splittedProposal.length <= currentTokenPosition)
+				continue;
+			if (!Arrays.equals(Arrays.copyOf(splittedToken, currentTokenPosition), previousTokens))
+				continue;
+			if (splittedProposal[currentTokenPosition].isEmpty())
+				continue;
+			
+			currentTokenProposal.add(splittedProposal[currentTokenPosition]);
+		}
+		
+		return () -> currentTokenProposal;
+	}
+	
+	@FunctionalInterface
+	public interface TabProposal {
+		public abstract Collection<String> getProposal();
+	}
+	
+	
+	
+	
+	/**
+	 * Throw an instance of this exception to indicate to the plugin command handler
+	 * that the user has missused the command. The message, if provided, must indicate
+	 * the reason of the mussusage of the command. It will be displayed on the screen
+	 * with eventually indication of how to use the command (help command for example).
+	 * If a {@link Throwable} cause is provided, it will be relayed to the plugin {@link Logger}.
+	 * 
+	 */
+	public static class BadCommandUsage extends RuntimeException {
+		private static final long serialVersionUID = 1L;
+
+		public BadCommandUsage() {
+			super();
+		}
+		
+		public BadCommandUsage(Throwable cause) {
+			super(cause);
+		}
+
+		public BadCommandUsage(String message) {
+			super(message);
+		}
+		
+		public BadCommandUsage(String message, Throwable cause) {
+			super(message, cause);
+		}
+	}
+	
+	
+	
+}