例如:
启动cassandra 不指定用户: nohup -c "$CASSANDRA_DIR/bin/cassandra" >> $CASSANDRA_DIR/logs/system.log 2>&1 & 用用户“cassandra”来启动cassandra服务: su - cassandra -c nohup -c "$CASSANDRA_DIR/bin/cassandra" >> $CASSANDRA_DIR/logs/system.log 2>&1 &