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Update join.md (#414)

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小弟调调™ 2022-09-05 17:29:40 +08:00 committed by GitHub
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@ -32,7 +32,9 @@ join(选项)(参数)
* 文件2：要进行合并操作的第2个文件参数。 * 文件2：要进行合并操作的第2个文件参数。
### 常见用法 ### 常见用法
把两个文件制定栏位内容相同的行连接起来： 把两个文件制定栏位内容相同的行连接起来：
```shell ```shell
[root@localhost ~]# cat name [root@localhost ~]# cat name
1 xiaoming 1 xiaoming
@ -49,7 +51,9 @@ join(选项)(参数)
2 xiaowang hubei wuhan 2 xiaowang hubei wuhan
3 xiaoliu hunan changsha 3 xiaoliu hunan changsha
``` ```
把两个文件指定列拼接起来： 把两个文件指定列拼接起来：
```shell ```shell
# 把name文件的第2列和city文件的第3列拼接起来 # 把name文件的第2列和city文件的第3列拼接起来
[root@localhost ~]# join -o 1.2 2.3 name city [root@localhost ~]# join -o 1.2 2.3 name city