Скачать или смотреть How to Find and Replace Strings in XML Files Using Linux

Learn how to effectively find and replace strings in XML files on Linux using xmlstarlet. Ensure safe editing of your XML configuration files with ease.
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This video is based on the question https://stackoverflow.com/q/71896976/ asked by the user 'beli3ver' ( https://stackoverflow.com/u/7279367/ ) and on the answer https://stackoverflow.com/a/71897065/ provided by the user 'zx485' ( https://stackoverflow.com/u/1305969/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Find and Replace Strings in XML Files Using Linux

Are you struggling to change specific values in your XML files on a Linux system? If you've ever needed to tweak configuration settings, such as changing a value from true to false, you're not alone. Let's dive into an efficient and safe way to achieve this without risking the integrity of your XML data.

The Challenge: Changing Values in an XML File

Suppose you have a configuration file located at /etc/rmm/config.xml that looks like this:

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Your goal is to change the value of Enabled from true to false. While it may be tempting to use basic text processing tools like awk or sed, these methods can jeopardize the structure of XML files. What can you do instead?

The Solution: Using xmlstarlet for Safe XML Editing

The best approach to safely edit XML files is by using the tool xmlstarlet. This utility provides a robust interface for processing XML and allows you to manipulate data without compromising its format. Here's how you can make the change seamlessly.

Step-by-Step Instructions

Install xmlstarlet (if it is not already installed):

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Run the xmlstarlet command to update your XML file. You will want to use the following command format:

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ed: This option edits the file.

-u: Indicates that you want to update an existing attribute.

/Service/@Enabled: This is the XPath expression targeting the Enabled attribute of the Service element.

-v "false": This sets the value of the attribute to false.

Example Input and Output

If you execute the above command on an input file like this:

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The resulting output would look like this:

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Changing All Instances

If your XML file contains multiple Service elements and you want to change all instances of Enabled attributes from true to false, you can modify the XPath like so:

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Conclusion

Using xmlstarlet not only simplifies the process of editing XML files in Linux but also ensures that your XML structure remains intact. By following this guide, you can easily manage your configuration files without the fear of corrupting them. Remember, when dealing with XML, always choose tools that respect its format to maintain data integrity.

Feel free to reach out if you have any questions or if you'd like further assistance with XML processing in Linux!