![]() If you don’t want that line to be shown pass the output to another grep instance as shown below. As you can see in the output above there is also a line containing the grep process. You can also chain multiple pipes in on command. Using Grep to Filter the Output of a Command #Ī command’s output can be filtered with grep through piping, and only the lines matching a given pattern will be printed on the terminal.įor example, to find out which processes are running on your system as user www-data you can use the following psĬommand: ps -ef | grep www-data www-data 18247 12675 4 16:00 ? 00:00:00 php-fpm: pool www To display the lines that do not match a pattern, use the -v ( or -invert-match) option.įor example, to print the lines that do not contain the string nologin you would use: grep -v nologin /etc/passwd root:x:0:0:root:/root:/bin/bashĬolord:x:124:124::/var/lib/colord:/bin/false If the string includes spaces, you need to enclose it in single or double quotation marks: grep "Gnome Display Manager" /etc/passwd Invert Match (Exclude) # The output should look something like this: root:x:0:0:root:/root:/bin/bash ![]() The most basic usage of the grep command is to search for a string (text) in a file.įor example, to display all the lines containing the string bash from the /etc/passwdįile, you would run the following command: grep bash /etc/passwd To be able to search the file, the user running the command must have read access to the file. ![]() #Linux find file name containing string how to#You have learned how to search for specific text in files on the Linux file system in this tutorial.The items in square brackets are optional. grep -rlw -exclude-dir="*apache2*" -e "tecadmin" /var/log For instance, don’t search for string files in any folder with apache2 in its name. You can also skip searching certain directories. grep -rlw -exclude="*.txt" -e "tecadmin" /var/log For example, you can exclude files with the. You can use the -exclude option in find to exclude some files that match certain file name criteria. grep -rlw -include="*.log" -e "Error" /var/log log extension in the /var/log directory and its sub-directories. The following command searches for “Error” in files with the. You can search strings in files that match the file name criteria. grep -rlw -e "Error" -e "Warning" /var/log Search multiple string in all files with command line The example below will look for “Error” and “Warning” in all the files in the /var/log directory and its subdirectories. The -e switch can also be utilized to find multiple strings. grep -rlw "Error" /var/log Search specific text in all files using command line The below example command will search the string “Error” in all files in /var/log directory and its sub-directories. Let’s discuss a few examples of searching a text/string in the file system. There are several ways to use the grep command to search text. -w, -word-regexp: force to match whole words.-e, -regexp=PATTERN: Use a pattern to search or specify multiple search strings.-i, -ignore-case: ignore case of search string.-l, -files-with-matches: Print string containing file names only.-L, -files-without-match: Print file names containing no match.-exclude-dir=PATTERN: directories that match PATTERN will be skipped.-exclude-from=FILE: skip files matching any file pattern from FILE. ![]()
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