![]() Syntax: command grep string Example: cat sample.txt grep legislature. This will be more clear when we go through the example. For more information on some of grep’s advanced features, check out our guide on how to search and filter text with grep. Like, using the cat command to display the content of the file but at the same time piping the output using the grep command to display only the content which you desire to see. 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. The first two are bang on the third is slightly off. Thirdly, it was written overnight to satisfy a particular need. Secondly, the wealth of options can be overwhelming. You may also redirect output from a command to grep using a pipe: tail -f /var/log/apache/error.log | grep 'some text' The grep command is famous in Linux and Unix circles for three reasons. 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 this guide, you’ll learn how to use the grep command. The grep command, which means global regular expression print, remains amongst the most versatile commands in a Linux terminal environment. ![]()
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