In this article, we have covered How to use logical operators (OR, AND & NOT) with Linux grep command. Process a binary file as if it were text this is equivalent to the -binary-filestext option. Places a line containing - between contiguous groups of matches. The name grep comes from the command, i.e. Print NUM lines of trailing context after matching lines. Linux grep command is awesome in pattern matching only if you know it very well. It is a command-line utility to search plain-text data groups for lines that are the same as a regular expression. By default, the search with grep is case-sensitive. Let's see a few common use cases of the grep command. (5) AND operator implement using -E optionīelow commands print lines that match pattern1 and pattern2 grep -E ' You probably already know that to search for a particular text or pattern in a file, you have to use grep like this: grep searchpattern filename. (4) AND operator usage example in grep by using multiple patternsīelow commands print lines that matches pattern1, pattern 2 and pattern 3 cat | grep 'pattern1' | grep 'pattern2' | grep 'pattern3' (3) Use -v option for using the NOT operator in grepīelow commands print lines that not matches pattern1 cat | grep -v ''
We will use the below data to demonstrate logical AND, OR, and NOT operators in grep:īelow commands print lines that match pattern1 or pattern2 till pattern n cat | grep '\|\|.'īelow commands print lines that match pattern1 or pattern2 till pattern n by using -E option cat | grep -E '||.' Click Here if you are interested in understanding Top Linux Commands for Beginners.Ĭlick Here if you are interested in Learning Linux Fundamentals Linux grep command comes for rescue, and you can use the logical operators' functionality of this command. Suppose you have logs of the firewall, and you want to search for specific IPs. Syntax: grep -i -v string filename Example: grep -i -v resource sample.txt. You can do this using the -v option with the grep command. We can use the grep command oppositely by hiding the matching lines and only displaying the lines where the match is not found. Linux grep command is used to filter information based on pattern matching. grep command can also be used in a reverse fashion.
This command will return a list of all the files and folders that start with Do in our current working directory. This article will see How to use logical operators (OR, AND, NOT) with Linux grep command. Consider the following example: ls grep Do. Linux grep is one of the most used commands by system administrators, computer programmers and ethical hackers.
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