It does 1-based line numbering for each file. Depending on what your file consists of, this will probably find almost anything. Basic Syntax of Grep to Find Strings/Text in Files/Directories. And of course, we can look for files that don’t contain the search term. The file names are listed, not the matching lines. Using the gnu criteria again the command looks like this $ grep gnu * and the output lists the files that contain gnu in. You ask grep to print all lines that contain a pattern consisting of a character that is not a 8, 3 or 4. The grep command is primarily used to search text or search any given file for lines containing a match to the supplied words/strings. like i want to search all line that don’t have ‘printf’. It’s important to note that this kind of command returns a line. Use … Follow the examples in this tutorial to learn how to utilize grep … To find out which C source code files contain references to the sl.h header file, use this command: grep -l "sl.h" *.c. file1 The grep executed in the subshell $() , will print all filenames which contain stringA . grep –m2 Phoenix sample. In this guide, we will show you how to use grep to search multiple words or string patterns. cmd: grep -n printf *.c. In this case, the terminal prints the first two matches it finds in the sample file. Individual files, such as log files, can contain many matches for grep search patterns. ! To see the names of the files that contain the search term, use the -l (files with match) option. $ cat file1 stringA stringC $ cat file2 stringA stringB $ grep -L stringB $(grep -l stringA file?) this will show all line that don’t have printf. The tool prints all lines that contain the words you specify as a search pattern. Show line number while displaying the output using grep -n. To show the line number of file with the line matched. By default, grep displays the matching lines, and it may be used to search for lines of text matching one/many regular expressions in a fuss-free, and it … cmd: grep -v printf *.c. Files in Folders . This will show you all printf in c files with line number. In this tutorial, we will show you how to find files that contain specific string in Linux. To show "everything but" grep has the -v switch. You can grep multiple strings in different files and directories. HAPPY PROGRAMMING !!!! This filelist is input for the main grep command, which lists all files that do not contain stringB . You can put an asterisk behind a grep command instead of a file name. For example we only would like to search for a specific text/string within configuration files with extension .conf.The next example will find all files with extension .conf within /etc directory containing string bash: Include or Exclude specific files names from search Using grep command it is also possible to include only specific files as part of the search. The basic syntax of grep command is shown below: grep -irhnwl "search string" "directory-path" Where:-i: Used to ignore case sensitive string.-r: Used to search directory recursively. The answer posted by Cyrus is absolutely proper and is The Right Way TM to do it with grep if we only need to find files.When filenames need to additional parsing or operations on the matched filenames, we can resort to using while loop with if statement. Limit the number of lines in the grep output by adding the -m option and a number to the command. 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