code: void updateAgentConfigurationFile(
  			TargetHandlerParameters parameters,
  			SSHClient ssh,
  			File tmpDir,
  			Map<String,String> keyToNewValue )
  	throws IOException {
  
  		this.logger.fine( "Updating agent parameters on remote host..." );
  
  		// Update the agent's configuration file
  		String agentConfigDir = Utils.getValue( parameters.getTargetProperties(), SCP_AGENT_CONFIG_DIR, DEFAULT_SCP_AGENT_CONFIG_DIR );
  		File localAgentConfig = new File( tmpDir, Constants.KARAF_CFG_FILE_AGENT );
  		File remoteAgentConfig = new File( agentConfigDir, Constants.KARAF_CFG_FILE_AGENT );
  
  		// Download remote agent config file...
  		ssh.newSCPFileTransfer().download(remoteAgentConfig.getCanonicalPath(), new FileSystemFile(tmpDir));
  
  		// Replace "parameters" property to point on the user data file...
  		String config = Utils.readFileContent(localAgentConfig);
  		config = Utils.updateProperties( config, keyToNewValue );
  		Utils.writeStringInto(config, localAgentConfig);
  
  		// Then upload agent config file back
  		ssh.newSCPFileTransfer().upload(new FileSystemFile(localAgentConfig), agentConfigDir);
  	}
docs: Updates the configuration file of an agent.
  @param parameters
  @param ssh
  @param tmpDir
  @param keyToNewValue
  @throws IOException