将 grep 用于多种搜索模式 [英] Using grep for multiple search patterns

问题描述

考虑我有以下数据流:

BODY1
attrib1:  someval11
attrib2:  someval12
attrib3:  someval13

BODY2
attrib1:  someval21
attrib2:  someval22
attrib3:  someval23

BODY3
attrib1:  someval31
attrib2:  someval32
attrib3:  someval33

我想为每个 BODY 提取仅 attrib1 和 attrib3，即

I want to extract only attrib1 and attrib3 for each BODY, i.e.

attrib1:  someval11
attrib3:  someval13
attrib1:  someval21
attrib3:  someval23
attrib1:  someval31
attrib3:  someval33

我试过了

grep 'attrib1|attrib3'，根据 这个网站 但没有返回任何内容.grep attrib1 和 grep attrib2 确实返回数据，但仅针对指定的单个模式.

grep 'attrib1|attrib3', according to this site but that returned nothing. grep attrib1 and grep attrib2 do return data but just for the single pattern specified.

推荐答案

grep -e 'attrib1' -e 'attrib3' file

来自 man 页面:

-e 模式，--regexp=模式
使用 PATTERN 作为模式.这可用于指定多个搜索模式，或保护以开头的模式连字符 (-).(-e 由 POSIX 指定.)

-e PATTERN, --regexp=PATTERN
Use PATTERN as the pattern. This can be used to specify multiple search patterns, or to protect a pattern beginning with a hyphen (-). (-e is specified by POSIX.)

或者，您可以将模式保存在文件中并使用 -f 选项:

Edit : Alternatively , you can save patterns in a file and use the -f option :

aman@aman-VPCEB14EN:~$ cat>patt
attrib1
attrib3

aman@aman-VPCEB14EN:~$ grep -f patt test
attrib1:  someval11
attrib3:  someval13
attrib1:  someval21
attrib3:  someval23
attrib1:  someval31
attrib3:  someval33

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