![]() We can also utilize below options with grep when looking out for special characters: We have used -E with pipe to provide conditional pattern which we have also used in our previous examples. We will try to grep some of them using grep. Here I have a sample file with some special characters # cat test1.txt We can provide the list of special characters to grep for using single quotes. ![]() grep string with special characters (brackets, dot, colon, quotes, wildcard, etc) $ grep -Ei '|' fileĪLSO READ: 10 sudo command examples in Linux Ģ4. ![]() To match strings with alphanumeric characters only, use the following syntax. grep strings with alphanumeric characters only You can use the following command to match strings with alphabetic characters only. grep strings with alphabetic characters only The following grep command gets all valid IPv4 addresses from a specified file. To use grep command with AND condition, use the following syntax. You can also use -e option to search for multiple patterns with OR condition. The following example prints the lines that contain either hours or movie in a test2.txt file. It prints the lines that contain either of the matching patterns. You have to separate patterns with a | symbol. You can use -E option to grep multiple patterns with OR condition. To search for lines that start with S, you can use ^S regex. $ grep -E "(^| )hours( |$)" test2.txtĪ caret ( ^) indicates the beginning of the line. Grepping patterns with spaces is helpful when you only want to match patterns that contain spaces.įor example, this command searches for an exact match hours with leading or trailing white space characters. The second command moves tmpfile to test.txt, replacing the old one.Īs you can see, all matching lines are removed. Here, the -v option is used to get non-matching lines and the output is redirected to a file tmpfile. $ grep -v strange test.txt > tmpfile
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