In the above examples, my text string was luckily in the same case as that found in my sample text files. Search for a String in a File Without Taking in Account the Case of the String This command will fetch all the sentences containing the string “sample file” from all the files with. This command will fetch all the sentences containing the string “sample file” from all the files with the filename containing the keyword “sample”. In case you want to search for sentences containing your text string from all the files of the same type, grep command is at your service. Search for a String in More Than One File The keyword and string appear in a colored form in the search results. My sample file sampleFile.txt contains the sentence having the string “sample file” that you can see in the above output. You can fetch a sentence from a file that contains a specific string of text through the grep command.Įxample: $ grep “sample file” sampleFile.txt This command will list all the files in the current directory with the name of the file containing the word “private”. ![]() If you want to search for a filename that contains a specific keyword, you can filter your file list through the grep command as follows: Here are a few examples: Search for Files The grep command can be best explained by presenting some scenarios where it can be made use of. You can verify the installation by checking the grep version through the following command: $ grep -version After that, the grep utility will be installed on your system. Then enter the following command as root in order to install grep through apt-get: $ sudo apt-get install grepĮnter y when you are prompted with a y/n option during the installation procedure. Open your Ubuntu Terminal either through the Dash or the Ctrl+Alt+T shortcut. Install grepĪlthough the grep utility comes by default with most Linux systems, if you do not have it installed on your system, here is the procedure: We have run the commands and procedures mentioned in this article on an Ubuntu 18.04 LTS system. In this article, we will explain the installation of the grep utility and present some examples through which you can learn exactly how and in which scenario you can use it. Let us explore the grep command some more. This command fetches all the lines in a file matching a certain text pattern. The purpose of the command is pretty similar to what we mean by searching through grep. So they say GREP stands for Global Regular Expression Print but where does this command ‘grep’ originate from? grep basically derives from a specific command for the very simple and venerable Unix text editor named ed. ![]() You can search for files and their contents for useful information fetching by specifying particular search criteria through the grep command. These are all Unix tools designed for performing the repetitive searching task on your files and text. The grep utility that we will be getting a hold of today is a Unix tool that belongs to the same family as the egrep and fgrep utilities. To demonstrate, run the following command: grep m*and. The * sign matches a pattern zero or more times. The following table shows each grep quantifier syntax with a short description. Quantifiers are metacharacters that specify the number of appearances. ![]() The complete list of grep character classes is in the grep manual. Below is a table that outlines some classes and the bracket expression equivalent. ![]() Grep offers standard character classes as predefined functions to simplify bracket expressions. The output highlights numbers and characters, ignoring all letters.
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