![]() ![]() ![]() Let us try a few more examples with additional options passed to the grep/egrep: For instance pass the -w and -color as follows:Īcme.sh -help | egrep -color -w - '-ca|-no' $ virt-sysprep -help | egrep - '-(truncate|run)'Īll other grep or egrep command option must appear before the final. ![]() In order to tell grep not to treat ‘ -‘ as command line option prefix pattern as follows: So if you try the following you will get an error on screen such as “ grep: unrecognized option : -ca|-no“. For example, search for pattern starting with ‘ -ca‘ or ‘ -no‘ words. Sometimes we need to grep multiple patterns with special character such as ‘ -‘ or ‘ -‘. $ egrep -w 'warning|error|critical' /var/log/messages Grep multiple patterns Use the egrep command and you can skip the above syntax to search three words: $ grep -w 'warning|error|critical' /var/log/messages $ grep 'warning|error|critical' /var/log/messages In this example, search warning, error, and critical words in a text log file called /var/log/messages, enter: # Show all the lines that do not match given pattern/words/strings #Įgrep -v ' pattern1| pattern2' /path/to/file Examples # Search all python files for 'wordA' or 'wordB' # Grep ' word1| word2| word3' /path/to/file Here are all other possibilities for grep and egrep command: Finally, try on older Unix shells/oses: grep -e pattern1 -e pattern2 *.pl.Next use extended regular expressions: egrep 'pattern1|pattern2' *.py.Use single quotes in the pattern: grep 'pattern*' file1 file2.To search multiple patterns, use the following syntax: The grep command supports regular expression pattern. How do I force grep to search multiple words? How can I grep for multiple patterns on Linux, OS X, FreeBSD, or Unix-like system? What is the command to search multiple words in Linux? 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. ![]()
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