For more information on some of grep’s advanced features, check out our guide on how to search and filter text with grep. Many other options exist, and in combination with other tools, it serves as an invaluable utility for performing administrative tasks on your Linode. These are simply a few basic ways to use grep. This example will search the /etc/ssh/sshd_config file for strings of alphabetic characters that are 16-20 characters long, but you can use any regex pattern you like. Regex patterns are also supported by the -E option if you want to search for a set of strings rather than one literal: grep -E "]" /etc/ssh/sshd_config This will monitor your Apache error logs, and display only the lines of output that contain the given string. You may also redirect output from a command to grep using a pipe: tail -f /var/log/apache/error.log | grep 'some text' To search a file for a particular string, provide the string and filename as arguments: grep 'some text' /etc/ssh/sshd_config Using grep allows you to filter that output in order to find only the data that’s relevant. When performing administrative tasks on your Linode, many commands will give you more information than you need. In our case, we named the file sample.txt and added a few paragraphs of text. ![]() ![]() In this guide, you’ll learn how to use the grep command. Examples of Using Grep for Multiple Strings, Patterns and Words To make sure you understand how to use grep to search multiple strings, we suggest creating a file with some text on which we are going to try out a couple of different use cases.
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