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doc: update awk.md.

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jaywcjlove 2022-10-31 00:11:04 +08:00
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@ -23,7 +23,7 @@ $ awk -F: '{print $1, $NF}' /etc/passwd
| | `$NF` | 最后一个字段 | | | `$NF` | 最后一个字段 |
| | `/etc/passwd` | 输入数据文件 | | | `/etc/passwd` | 输入数据文件 |
### Awk program ### Awk 程序
```bash ```bash
BEGIN {<初始化>} BEGIN {<初始化>}