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awk从入门到入土（2）认识awk内置变量和变量的使用
2022-07-03 02:13:00 【奇妙之二进制】
学习任何一门语言都是从变量开始。
内置变量表
| 属性 | 说明 |
|---|---|
| $0 | 当前记录（作为单个变量） |
| 1 1~ 1 n | 当前记录的第n个字段，字段间由FS分隔 |
| FS | 输入字段分隔符 默认是空格 |
| NF | 当前记录中的字段个数，就是有多少列 |
| NR | 已经读出的记录数，就是行号，从1开始 |
| RS | 输入的记录的隔符默 认为换行符\n |
| OFS | 输出字段分隔符 默认也是空格 |
| ORS | 输出的记录分隔符，默认为换行符 |
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