如何在gbase命令行工具中调用linux系统命令
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gbase命令行工具中支持通过system关键字的方式调用操作系统命令，用于更改当前路径、查看系统变量、查看文本内容。
命令格式为：system linux_os_cmd
例如：
gbase> system gcadmin
CLUSTER STATE: ACTIVED
CLUSTER MODE: NORMAL
+==========================================================================================================================+
| GCLUSTER INFORMATION |
+==========================================================================================================================+
+-------+----------+-----------------+--------+--------+---------+---------+----------+------------+-----------+-----------+
| rowid | nodename | IpAddress | sgname | dpname | gcware | gnode | gcluster | syncserver | datastate | nodestate |
+-------+----------+-----------------+--------+--------+---------+---------+----------+------------+-----------+-----------+
| 1 | node1 | 192.168.105.210 | sg01 | n1 | Online | OPEN | OPEN | OPEN | [0] | [0] |
+-------+----------+-----------------+--------+--------+---------+---------+----------+------------+-----------+-----------+
| 2 | node2 | 192.168.105.211 | sg01 | n2 | Online | OPEN | OPEN | OPEN | [0] | [0] |
+-------+----------+-----------------+--------+--------+---------+---------+----------+------------+-----------+-----------+
| 3 | node3 | 192.168.105.212 | sg02 | n3 | Online | OPEN | OPEN | OPEN | [1] | [0] |
+-------+----------+-----------------+--------+--------+---------+---------+----------+------------+-----------+-----------+
| 4 | node4 | 192.168.105.213 | sg02 | n4 | Online | OPEN | OPEN | OPEN | [0] | [0] |
+-------+----------+-----------------+--------+--------+---------+---------+----------+------------+-----------+-----------+
gbase> system pwd
/home/gbase
gbase> system cat tab1.txt1
1,,2015-03-19 17:51:31
2,abc,2015-03-19 17:51:43