![]() Restart when prompted.Įnable-WindowsOptionalFeature -Online -FeatureName VirtualMachinePlatform, Microsoft-Windows-Subsystem-Linux Open a PowerShell window as admin and run below command. ![]() For ARM64 systems, it should be version 2004 or higher, with Build 19041 or higher. For 圆4 systems, it should be version 1903 or higher, with Build 18362 or higher. Verify if you are running on the correct version of Windows 10 by using winver.These are the instructions for those, who dont want to bother to read through whole document: Let’s see the few variants of grep to help us searching the information that we seek.įor the purpose of this blog post, we will be searching files on a Windows 10 machine.įor full instructions, refer to the official instructions for enabling WSL2. With WSL2, you can use traditional linux utilities to assist with your work on Windows OS as well. Windows users have relied on finding files using easy user interface and Select-String cmdlet. Linux users have always boasted of being able to use grep utility. At some point, when working with computers, you would like to find files containing specific text/data/string/content/information or whatever term you use. $ xml sel -t -c "//book" books.Who doesn’t have to search files for specific content in them. Since xmllint and XMLStarlet only support XPath 1.0, they cannot evaluate this XPath expression: $ xmllint -xpath "//book" books.xml Great, it works with the XPath 3.0 expression! Let’s see if xidel can evaluate this XPath expression and find the books we’re interested in: $ xidel -s -printed-node-format="xml" -xpath "//book" books.xml ![]() So, we’ll write an XPath expression using the sequence data type to print book elements if its publishing year is in a given sequence of values: //book The sequence data type has been around since XPath 3.0. Using the xidel Commandįinally, let’s test if the xidel command can work with XPath 3.0 expressions. Thus, the text of each matching element will be printed to a separate line. That’s because when the result has multiple elements, the will sit in a element, something like: This time, the line breaks are not removed. Next, let’s see what we’ll get if we use the -v option: $ xml sel -t -v "/books/book/title" books.xmlĪs the output shows, when we use the -v option, we’ll get the text of the matching elements, with each value on a separate line. This happens because the line breaks between elements are treated as whitespace, meaning that the instruction will remove all whitespace between elements. However, the output is not “pretty-printed.” The line breaks between XML elements are somehow swallowed. When we use the -c option, the output contains the two expected title elements. Understanding the Linux KernelA Game of Thrones $ xml sel -t -c "/books/book/title" books.xml Our goal is to evaluate XPath expressions. ![]() In this tutorial, we won’t dive into XSLT transformation. Using the sel command, we create a template using the -t option. XSLT template is a fundamental concept of XSLT. Let’s have a look at the general syntax of the sel command: xml sel -t Input.xml That is to say, when we use the sel command, XMLStarlet will convert all our command arguments into XSLT to do the query on the input XML documents. It can generate XSLT for us from the combination of command-line options. In fact, the sel command can do much more than XPath expression evaluation.īasically, the sel command allows us to avoid writing an XSLT stylesheet to perform some XML document queries. To select data or query XML documents using XPath, we can take the sel ( select) command. XMLStarlet defines a set of commands to perform different XML operations - for example, ed ( edit) to edit or update an XML document, tr ( transform) to transform an XML document using XSLT, and so on. In this tutorial, we’re going to discuss three different approaches to work with XPath under the command line: //book/title – this XPath expression selects all the book title elements if the year of publishing is later than 2004 (the “ year” element has a value greater than 2004).– this XPath expression selects all the title elements of books written in French (the “ book” element has a “ lang” attribute with a value of “ fr“).Later, we’ll address how to evaluate a couple of XPath expressions under the Linux command line: In our books.xml file, we have four books. First of all, let’s create an XML document, books.xml, as the input XML file that we’ll use throughout this tutorial:
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