8) Finding specific dot deb package listing $ dpkg -l | grep -i nginx Later grep command can filter out the required text. In the second example, the cat command appends all the text from filename2 to filename1 at the endpoint of filename1 text. Searching specific phrases or from multiple files might be quite complicated. $ cat filename1 filename2 filename3 | grep -i ‘search-text’Ĭat command allows us to view a single file, multiple files, concatenate files. :~$ ls -l /etc | grep sudoĭrwxr-xr-x 2 root root 4096 Feb 12 10:17 sudoers.d In Linux pipe command lets you send the output of one command to another.
Listing files and directories using the ls command will be easier if there are fewer files or dir.įor many files and directories, we can filter out them using grep with pipe ( | ) which helps us to locate the file faster. $ 6) Listing files and directories using grep Passing this option will show results with the line number which help us to locate the search texts in files. We can do so in the grep command by adding the hyphen n (-n) option. Searching words or sentences is easier using the grep command but it will be much easier if we could also view the line numbers where the search word is located. $ 5) Searching the line or word along with the line numbers etc/ufw/les:-A DOCKER-USER -i enp0s3-j DROP etc/ufw/les:-A DOCKER-USER -i enp0s3 -j ufw-user-input It informs the command to check all files recursively from all directories and sub-directories of the given path. Let’s assume we have files in directories and their sub-directories also have some files, we want to search words or sentences from all those files to do so we need to add hyphen r (-r). $ 4) Search words recursively from files & directories For that, we use the hyphen w (-w) option to perform such a search. What if we want to search by words only not by sub-string. In the above example, the grep command shows the output based on the sub-string. In such a case we can use the -i option to get outputs case-insensitively. Suppose we have a paragraph that contains the same words with different cases. Nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologinīy default grep command output our searched text case-sensitively. Example is shown below: $ grep nobody /etc/passwd The output will be the row containing search text or word. If our working directory and file directory are different we need to specify the file path with filename. Then, we simply need to use the grep command then specify the regex pattern or word we want to search. 1) Search text from the file.Ĭreate a new text file that contains some text. Let’s dive into examples of grep command. Regex is a sequence of characters that specifies a search pattern. The pattern implies plain text or regular expression (shortened as regex) to search matching sets of data. You can use the following command to check info on all options. Option refers to the extra parameters to invoke or access the inbuilt feature.
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