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head, tail コマンドを同時に実行

テスト用に 1 から 100 が書かれたファイルを作成します。

create-output
$ for i in {1..100}; do echo $i >> output.txt; done

上から5件取得したい場合

head
$ head -5 output.txt
1
2
3
4
5

下から5件取得したい場合

tail
$ tail -5 output.txt
96
97
98
99
100

上から5件、下から5件を同時に取得したい場合

そのファイルがタイムスタンプを持つ場合、最初と最後の値が同時に取得できるなど、意外と使い道はあるかもしれません。

head-tail
$ (head -5;tail -5) < output.txt
1
2
3
4
5
96
97
98
99
100
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