How do I search multiple strings or words using the grep command? For example I'd like to search word1, word2, word3 and so on within /path/to/file. How do I force grep to search multiple words?
The grep command supports regular expression pattern. To search multiple words, use following syntax:
grep 'word1\|word2\|word3' /path/to/file
In this example, search warning, error, and critical words in a text log file called /var/log/messages, enter:
To just match words, add -w swith:
egrep command can skip the above syntax and use the following syntax:
I recommend that you pass the -i (ignore case) and --color option as follows:
The grep command supports regular expression pattern. To search multiple words, use following syntax:
grep 'word1\|word2\|word3' /path/to/file
In this example, search warning, error, and critical words in a text log file called /var/log/messages, enter:
$ grep 'warning\|error\|critical' /var/log/messagesTo just match words, add -w swith:
$ grep -w 'warning\|error\|critical' /var/log/messagesegrep command can skip the above syntax and use the following syntax:
$ egrep -w 'warning|error|critical' /var/log/messagesI recommend that you pass the -i (ignore case) and --color option as follows:
$ egrep -wi --color 'warning|error|critical' /var/log/messages
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