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本系列的awk教程中，将大量使用到如下示例文件a.txt。

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ID  name    gender  age  email          phone
1   Bob     male    28   [email protected]     18023394012
2   Alice   female  24   [email protected]  18084925203
3   Tony    male    21   [email protected]    17048792503
4   Kevin   male    21   [email protected]    17023929033
5   Alex    male    18   [email protected]    18185904230
6   Andy    female  22   [email protected]    18923902352
7   Jerry   female  25   [email protected]  18785234906
8   Peter   male    20   [email protected]     17729348758
9   Steven  female  23   [email protected]    15947893212
10  Bruce   female  27   [email protected]   13942943905