Linux用grep匹配多个关键词，并显示前几行或者后面几行的内容

1、grep过滤多个关键词并输出内容

grep "key1" file.txt |grep "key2" |grep "key3"

grep “key1” file.txt |grep “key2” |grep “key3”

2、grep过滤多个关键词并输出前10行内容

grep "key1" file.txt |grep "key2" |grep "key3" |head -n 10

grep “key1” file.txt |grep “key2” |grep “key3” |head -n 10

3、grep过滤多个关键词并输出后10行内容

grep "key1" file.txt |grep "key2" |grep "key3"|tail -n 10

grep “key1” file.txt |grep “key2” |grep “key3”|tail -n 10

4、grep过滤多个关键词并输出10~20行内容

grep "key1" file.txt |grep "key2" |grep "key3"|head -n 20 |tail -n 10

grep “key1” file.txt |grep “key2” |grep “key3”|head -n 20 |tail -n 10

输出7~13

grep “key1” file.txt |grep “key2” |grep “key3”|head -n 13 |tail -n 5
在输出前面13行的内容前提基础下，再输出后面5行内容（13-7=5），就是输出7~13的内容了

5、grep过滤多个关键词并输出10~20行内容到文件test.txt

grep "key1" file.txt |grep "key2" |grep "key3"|head -n 20 |tail -n 10 >> test.txt

grep “key1” file.txt |grep “key2” |grep “key3”|head -n 20 |tail -n 10 >> test.txt

结论:
灵活运用管道符 | ，管道符用于连接多个命令，前一个命令的结果作为下一个命令的输入参数。简单来说，grep前面的筛选结果在后面再筛选几次，然后head,把所输出的内容的前几行输出。
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