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Centos grep usage1/4/2023 f FILE, -file=FILE Obtain patterns from FILE, one per line. This option can be used to protect a pattern beginning with “-”. If this option is used multiple times or is combined with the -f (-file) option, search for all patterns given. Matching Control -e PATTERN, -regexp=PATTERN Use PATTERN as the pattern. This is highly experimental and grep -P may warn of unimplemented features. P, -perl-regexp Interpret the pattern as a Perl-compatible regular expression (PCRE). G, -basic-regexp Interpret PATTERN as a basic regular expression (BRE, see below). F, -fixed-strings Interpret PATTERN as a list of fixed strings (instead of regular expressions), separated by newlines, any of which is to be matched. Matcher Selection -E, -extended-regexp Interpret PATTERN as an extended regular expression (ERE, see below). V, -version Output the version number of grep and exit. Option -help Output a usage message and exit. Grep $ grep a test1 Cat Man $ grep an test1 ManĢ. จากตัวอย่าง file test1 $ cat test1 Ant Bee Cat Dog Fly A reason why I like pdfgrep is that it tries to be compatible with GNU Grep. #CENTOS GREP USAGE PDF#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. #CENTOS GREP USAGE HOW TO#Now that pdfgrep is installed let me show you how to use it in most common scenarios. #CENTOS GREP USAGE INSTALL#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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