Now, I want to have a closer look at the files from the. So, let’s investigate that a little bit more. Yes, apparently there was some Nashorn-specific tests. "test": "node npm/test/builder.js & node npm/test/unsupported-features.js & node npm/test/jasmine-browser.js & node npm/test/jasmine-browser-min.js & node npm/test/jasmine-node.js & node npm/test/jasmine-webpack.js & npm run test:karmaBrowserify & npm run test:karmaRequirejs & node npm/test/nashorn.js", I do not know Nashorn, so I could take that opportunity to learn more about it by exploring the project parts referencing that JavaScript engine.Īs a starting point, I checked if there were some settings related to Nashorn in the package.json file describing the project dependencies: :~$ grep nashorn package.json Find all occurrences of a string (basic usage)Īsciidoctor.js is supporting the Nashorn JavaScript engine for the Java platform. ![]() That will ensure you obtain results perfectly identical to those described in the rest of this article: git clone You can download that source tree from GitHub, and if you want, you may even check out the same changeset I used when writing this article. ![]() So, I will use the Asciidoctor.js source tree to illustrate some of the grep capabilities. It is always better to have real-world examples to learn how things work. However, don’t be fooled by such humble definition: grep is one of the most useful tools in the Unix toolbox and there are countless occasions to use it as soon as you work with text files. If you look into the man, you will see that short description for the grep tool: “print lines matching a pattern.” Real-life useful examples of the grep commands in Linux I am going to share with you how to use grep command in Linux with examples. But my secret weapon to find my way through so many code lines is the grep tool. It is not always easy to be immediately effective when you dig for the first time into a codebase containing several thousand of lines. Just omit the -q from the grep command and let the output be written.Recently, I started working with Asciidoctor.js and on the Asciidoctor.js-pug and Asciidoctor-templates.js project. If you are actually using echo $(cmd) intentionally to squash whitespace or are using flags in the output of cmd, you have a code readability issue!) In this case, there is an easier solution than using echo here, though. ![]() ( echo will squeeze whitespace and perhaps treat some of the output of cmd as flags, so the output is not always identical, but it is almost always what you want. Instead of echo $(cmd), you can almost always just do cmd and cut out the middle man. The $() gathers the output of cmd and passes it as arguments to echo, which then writes them. In your original code, you have the line echo $(cat test.txt | grep '$searchT'), which has several issues, but I will just address the anti-pattern echo $(cmd). Note that you should use double quotes so that "$searchT" is expanded and its value is passed as the argument to grep, and there is no need for cat. So you probably just want to do: if grep -q -wi "$searchT" test.txt then grep succeeds if it matches, and fails if it does not. ![]() It's not precisely clear what you are trying to match, but remember that if takes a command and evaluates its returns value.
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