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This article mainly introduces Linux using grep to filter multiple conditions and grep common filtering commands, friends who need can refer to.

Cat log.txt | grep condition

Cat log.txt | grep condition 1 | grep condition 2

Cat log.txt | grep condition 1 | grep condition 2 | grep condition 3

Grep condition 1 log.txt | grep condition 2 | grep condition 3

Don't talk nonsense, for example, you need to exclude mmm nnn from abc.txt

Grep-v 'mmm\ | nnn' abc.txt

However, this is still a lot. We need to find the required ip address from these messages. We may have thought of using grep-v to block inet6. The result is as follows:

1. | bash-3.2# ifconfig | grep inet | grep-v inet62, | inet 127.0.0.1 netmask 0xff0000003, | inet 10.60.104.38 netmask 0xfffffe00 broadcast 10.60.105.255

Let's take a look at the common filtering commands in linux grep

The filtered content can be a phrase, etc., and needs to be wrapped in quotation marks

1. Get the keyword key: cat fileName | grep "key" in the file

two。 Get one of the keywords key1, key2, key3: cat fileName in the file | grep-E "key1 | key2 | key3"

3. Get multiple keywords in the file and satisfy: cat fileName | grep key1 | grep key2 | grep key3

4. Ignore a keyword in the file and escape "|": cat fileName | grep-v "key1\ | key2\ | key3"

These are the details of how Linux uses grep to filter multiple conditions, please pay attention to other related articles!

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