11/5/2023 0 Comments Grep unique countPuppies are now ready to move on to their new homes for all time. Puppies get regular deworming, vaccines, veterinary exams, and microchipping. Puppies who are reared at home and have great socialisation are used to hearing youngsters playing and other people's voices. These delightfully funky packages need five-star homes. $ egrep 'Manager|Developer' employee.We are overjoyed to announce that our healthy litter of the prettiest Pug puppies has arrived. 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). grep -v 'pattern1' filenameįor example, display all the lines except those that contains the keyword “Sales”. i.e It matches all the lines except the given pattern. Also, comparisons honor the rules specified by LCCOLLATE.' One of the correct ways, to invoke with: sort nonUnique.txt uniq. You may want to sort the input first, or use sort -u without uniq. Using grep -v you can simulate the NOT conditions. Just FYI, From the uniq Man page: 'Note: uniq does not detect repeated lines unless they are adjacent. $ grep Manager employee.txt | grep Salesĥ00 Randy Manager Sales $6,000 Grep NOT 7. 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). sort options: -n, -numeric-sort compare according to string numerical value -r, -reverse reverse the result of comparisons. uniq options: -c, -count prefix lines by the number of occurrences. Grep -E 'pattern1.*pattern2|pattern2.*pattern1' filename The accepted answer is almost complete you might want to add an extra sort -nr at the end to sort the results with the lines that occur most often first. But, you can simulate AND using grep -E option. $ grep -e Tech -e Sales employee.txtĥ00 Randy Manager Sales $6,000 Grep AND 5. Use multiple -e option with grep for the multiple OR patterns. grep -e pattern1 -e pattern2 filenameįor example, grep either Tech or Sales from the employee.txt file. Use multiple -e option in a single command to use multiple patterns for the or condition. Using grep -e option you can pass only one parameter. $ egrep 'Tech|Sales' employee.txtĥ00 Randy Manager Sales $6,000 4. Just use the | to separate multiple OR patterns. To reduce the number of results that are displayed, use the -m (max count) option. For which, the -o flag gets the occurrence of that string, while wc -l will count the number of times the occurrence appears on each line. The line number for each matching line is displayed at the start of the line. If however you want to count the number of occurrences of a string, beyond simply the number of lines, then the command can be used: grep -o string wc -l. egrep 'pattern1|pattern2' filenameįor example, grep either Tech or Sales from the employee.txt file. You can make grep display the line number for each matching line by using the -n (line number) option. So, use egrep (without any option) and separate multiple patterns for the or condition. Grep OR Using egrepĮgrep is exactly same as ‘grep -E’. $ grep -E 'Tech|Sales' employee.txtĥ00 Randy Manager Sales $6,000 3. 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. $ grep 'Tech\|Sales' employee.txtĥ00 Randy Manager Sales $6,000 2. Without the back slash in front of the pipe, the following will not work. grep 'pattern1\|pattern2' filenameįor example, grep either Tech or Sales from the employee.txt file. If you use the grep command without any option, you need to use \| to separate multiple patterns for the or condition. 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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