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Grep ignore case comment9/16/2023 Note that on some systems you may also have to use the -print option at the end of that command, like this:įind. (FWIW, I add the -type f option to tell find to just look for files, and not directories.) Here's how I did a case-insensitive search trying to find the same typeahead files with the find command: If for some reason you can't find your files with the Linux locate command, or your system doesn't have the locate command installed, you can also try searching with the traditional Unix find command. To search my entire filesystem for files and directories that contain the string typeahead, just use this command:Ĭase-insensitive file searching with the find command It's easy to perform a case-insensitive file search with the Linux locate command: just add the -i flag. Case-insensitive file searching with the locate command Both the find command and the locate command have command-line options that provide this support. I was happy to learn that both of my favorite Unix and Linux file-finding utilities support case-insensitive file searching. While trying to remember where I put it I realized I was going to have to do some case-insensitive file searching. Give it a try and let me know what you think of pdfgrep.Earlier today someone asked for the source code for my TypeAhead predictive-text, type-ahead, auto-complete JNLP Swing application. A reason why I like pdfgrep is that it tries to be compatible with GNU Grep. Pdfgrep is a very handy tool if you are dealing with PDF files and want the functionality of ‘grep’, but for PDF files. I do not have a password-protected file to demonstrate with, but you can use this option in the following manner: pdfgrep -password Conclusion All you have to do is use the –password option, followed by the password. Yes, pdfgrep supports grep-ing even password-protected files. Look closely at the time indicated by ‘real’ value.Īs you can see, the commands that include –cache option were completed faster than the ones that didn’t include it.Īdditionally, I suppressed the output using the –quiet option for faster completion. To show the speed difference, I used the time command. Twice with cache enable and twice without cache enable. While not the be-all and end-all, I carried out a search 4 times. Let’s try doing a basic search for the text ‘xdg’ in the PDF file. The syntax for pdfgrep is as follows: pdfgrep Normal search It’s one of the few Linux books that are legally available for free. To demonstrate, I will be using The Linux Command Line PDF book, written by William Shotts. If you have any experience with grep, then most of the options will feel familiar to you. Now that pdfgrep is installed let me show you how to use it in most common scenarios. You can use your distribution’s package manager to install this awesome tool.įor users of Ubuntu and Debian-based distributions, use the apt command: sudo apt install pdfgrepįor Red Hat and Fedora, you can use the dnf command: sudo dnf install pdfgrepītw, do you run Arch? You can use the pacman command: sudo pacman -S pdfgrep Using pdfgrep command Though it doesn’t come pre-installed like grep, it is available in the repositories of most Linux distributions. You can use to search for text inside the contents of PDF files. Several of your favorite grep options are supported (such as -r, -i, -n or -c). Pdfgrep tries to be compatible with GNU Grep, where it makes sense. Meet pdfgrep: grep like regex search for PDF files This is where pdfgrep comes into the picture. It won’t work on PDF files because they are binary files. Check out some common grep command examples if you are interested.īut grep works only on plain text files. It can do crazy powerful things, like search for new lines, search for lines where there are no uppercase characters, search for lines where the initial character is a number, and much, much more. Grep is used to search for a pattern in a text file. Even if you use the Linux command line moderately, you must have come across the grep command.
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