In the second example, we used multiple grep commands and pipes to match lines containing both “dfff” and “apple” words in the file test6.txt. ➜ grep -n -w -e "dfff" -e "apple" test6.txt In the first example, we use the grep -e option to match the line containing the word “dfff” or “apple” in the file test6.txt. * Match file containing keyword1 or containing keyword2 … : OR * Match file containing keyword1 and containing keyword2 … : AND The digit option for grep is also very useful to search line which will start from digit 0-9 i.e.
But matching multiple keywords has two meanings: Grep matches multiple keywords, which we often use on a daily basis. Sometimes, however, we also need to count the keyword to appear in the file, at the same time, according to the line number in reverse order. To reduce the number of results that are displayed, use the -m (max count) option. The line number for each matching line is displayed at the start of the line. In the example above, we can count the number of lines or the total number of occurrences of a keyword in a file. You can make grep display the line number for each matching line by using the -n (line number) option. In the following example, the grep directory contains files whose filenames contain the keyword “test”, and we use the ls command, pipe, and wc command to count the number of files whose filenames contain the keyword “test” in the directory. Grep count the number of files in the directory whose filename contains the specified keyword
w, -word-regexp The expression is searched for as a word (as if surrounded by `]' see re_format(7)). o, -only-matching Prints only the matching part of the lines. In the following example, we use grep -w to count the number of times of the string “dfff” in the file ➜ grep -o -w "dfff" test6.txt | wc -l Options: Grep counts the number of times of the specified content in a file You can also use the grep command, pipe, and wc command to achieve the same effect as the grep-c option in the following example. Using grep -c options alone will count the number of lines that contain the matching word instead of the number of total matches.
In the following example, we will use the grep command to count the number of lines in the file test6.txt that contain the string “dfff” ➜ grep -c "dfff" test6.txt Grep counts the number of lines in the file that contain the specified content
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