9/27/2023 0 Comments Find and grep examples![]() The word "fruit" appears 3 times in the file. This is how the -c flag works: grep -c "fruit" fruits.txt We can count the number of times the matched string appears in the file. How to Count the Number of Occurrences of the Provided Pattern using -c ![]() This would include occurrences like "grape fruit", "dragon fruit" and so on like this:īut, if we only want "fruit" in our results, we can use the -w flag like this: grep -w "fruit" fruits.txtĭo you see the difference? The latter result returned only one line where the exact word "fruit" was found. If we grep "fruit" without any flags, it would return any occurrence of the word "fruit". If you were to match an exact word rather than just the occurrence of a pattern, you can do so by using the -w flag. How to Find the Exact Matching Word from the Input File or String using -w For that, we can supply the -n flag to grep like this: grep -n "berries" fruits.txtįrom the output, we can see that the word "berries" occurs on line #5 of the file. There are times when we want to get the line numbers against the matching string. How to Find the Line Numbers Against Matching Input using -n The output returned all the lines that do not contain "berries". Let's say, if we want to get all the lines that do not contain the word "berries", the command would look like this: grep -v "berries" fruits.txt We can reverse the results of the grep command to include non-matching results. Output: How to Select the Non-Matching Lines using -v It should match all occurrences of "berries" regardless of their case. Let's find the word "berries" from our sample file. We can command grep to return results while ignoring the case of the matching string. ![]() Here's the output: How to Ignore Case Distinctions using -i If we want to find the string "fruit" in the file fruits.txt, we can do so like this: grep "fruit" fruits.txt Contents of fruits.txt How to Find a Matching String with grep Melons – watermelons, rockmelons and honeydew melons Tropical and exotic – bananas and mangoesīerries – strawBERRIES, raspberries, blueberries, kiwifruit and passionfruit Stone fruit – nectarines, apricots, peaches and plums In the coming examples, we will use the file fruits.txt with the following content: apples and pearsĬitrus – oranges, grapefruits, mandarins and limes
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