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All commands available in the shell service are implemented as OSGi services. The advantage of this approach is two-fold: the shell service can leverage OSGi service events to maintain its list of available commands and the set available commands is dynamically extendable by installed bundles. The command service interface is defined as follows:

package org.ungovernedapache.osgi.servicefelix.shell;

public interface Command
{
    public String getName();
    public String getUsage();
    public String getShortDescription();
    public void execute(String line, PrintStream out, PrintStream err);
}

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