![]() You can also combine NOT with other operator to get some powerful combinations.įor example, the following will display either Manager or Developer (bot ignore Sales). 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. Note: Using regular expressions in grep is very powerful if you know how to use it effectively. $ grep -E 'Manager.*Sales|Sales.*Manager' employee.txt ![]() 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 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. Just use the | to separate multiple OR patterns.Įgrep is exactly same as ‘grep -E’. grep -v 'unwantedword' file grep XXXXXXXX grep -v 'unwantedword' file will filter the lines that have the unwantedword and grep XXXXXXXX will list only lines with pattern XXXXXXXX. 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. You can do it using -v (for -invert-match) option of grep as. 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. For these, rows, use strsplit() to break these IPs up into 4 number groups. I prefer method number 3 mentioned below for grep OR operator. grep(RegEx,listName), Returns indices of strings in the list. 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. Given a list of IP addresses: 192.168.37.1Įxample searches: $ grepcidr 192.168.37.0/30 $ grepcidr 192.168.37.0/29 $ grepcidr 192.168.37.128/28 demo-ips.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. This command will match any IP address in the typical CIDR boundary. Use grepcidr to eliminate RegEx and pattern matching. These methods make it very difficult to find specific IP addresses in a range if it does not fall on an easy to match pattern. For the longest time I used regular expressions or basic grep patterns to look for IP addresses within text files.
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