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grepで指定行数スキップする

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grepは指定バイト数スキップのオプション(-b, --byte-offset)は有るけど、指定行数スキップするオプションはない。
判り切っているヘッダを除外してgrepしたい場合など、以下の様に、tailを組み合わせて処理します。

tail -n +10 foo.txt | grep "bar"

tailの-nオプションは、tailい表示する行数を指定するオプションですが、「+10」の様に指定すると10行目以降を表示するという指定になります。

実行例
user@hostname ~
$ cat testdata.txt
1, 0
2, 2
3, 4
4, 6
5, 8
6, 0
7, 2
8, 4
9, 6
10, 8
11, 0
12, 2
13, 4
14, 6
15, 8
16, 0
17, 2
18, 4
19, 6
20, 8
21, 0
22, 2
23, 4
24, 6
25, 8

user@hostname ~
$ grep ", 8" testdata.txt
5, 8
10, 8
15, 8
20, 8
25, 8

user@hostname ~
$ tail -n +10 testdata.txt | grep ", 8"
10, 8
15, 8
20, 8
25, 8

user@hostname ~
$
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