12/7/2022 0 Comments Linux grep usage![]() ![]() ![]() i.e It matches all the lines except the given pattern.įor example, display all the lines except those that contains the keyword “Sales”. Using grep -v you can simulate the NOT conditions. The following example will grep all the lines that contain both “Manager” and “Sales” in the same line. Grep -E 'pattern1' filename | grep -E 'pattern2' You can also use multiple grep command separated by pipe to simulate AND scenario. #Linux grep usage how toNote: Using regular expressions in grep is very powerful if you know how to use it effectively. The grep command searches for the pattern specified by the Pattern parameter and writes each matching line to standard output. find grep 'file' You can also use patterns directly with find, eliminating the need for grep. If you already have scripts using grep, it will be pretty easy to convert them to matching this way. $ grep -E 'Manager.*Sales|Sales.*Manager' employee.txt The most basic usage is to use find on its own to print out a list of files, including subdirectories, and feed that input to grep. The following example will grep all the lines that contain both “Manager” and “Sales” in it (in any order). The following example will grep all the lines that contain both “Dev” and “Tech” in it (in the same order). ![]() Grep -E 'pattern1.*pattern2|pattern2.*pattern1' filename Grep can do much more than just search the contents of a specific file. But, you can simulate AND using grep -E option. Use multiple -e option with grep for the multiple OR patterns.ĥ. Use multiple -e option in a single command to use multiple patterns for the or condition.įor example, grep either Tech or Sales from the employee.txt file. Using grep -e option you can pass only one parameter. So, use egrep (without any option) and separate multiple patterns for the or condition. The Grep (global regular expression print) command. The grep command is case-sensitive, and it will search for text that matches the case of the text that you specify. It can be used to find text in files, or to find text in the output of other commands. Just use the | to separate multiple OR patterns.Įgrep is exactly same as ‘grep -E’. The grep command in Linux is a command line utility for searching files for text patterns. If you use the grep command with -E option, you just need to use | to separate multiple patterns for the or condition.įor example, grep either Tech or Sales from the employee.txt file. Without the back slash in front of the pipe, the following will not work. If you use the grep command without any option, you need to use \| to separate multiple patterns for the or condition.įor example, grep either Tech or Sales from the employee.txt file. I prefer method number 3 mentioned below for grep OR operator. Use any one of the following 4 methods for grep OR. You already knew that grep is extremely powerful based on these grep command examples. The following employee.txt file is used in the following examples. The examples mentioned below will help you to understand how to use OR, AND and NOT in Linux grep command. But, you can simulate AND using patterns. Question: Can you explain how to use OR, AND and NOT operators in Unix grep command with some examples?Īnswer: In grep, we have options equivalent to OR and NOT operators. ![]()
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