xmlstarlet:tldr:1338d

The xmlstarlet select command is used to extract information from an XML file based on a specific XPath expression. XPath is a query language used to navigate through elements and attributes in an XML document.

In the given command:

• --template is an option that specifies how the selected output should be formatted. It can be used to apply a specified template to the selected nodes.
• --copy-of is another option that specifies the action to perform on the selected nodes. It copies the selected nodes to the output.
• ${xpath} is a placeholder for the XPath expression that needs to be evaluated. You need to provide a valid XPath expression in place of ${xpath} to select the desired nodes or information from the XML document.
• ${filename-xml} is a placeholder for the name or path of the XML file you want to process. You need to replace ${filename-xml} with the actual name or path of the XML file you want to work with.

Once you have replaced the placeholders and executed the command, it will evaluate the provided XPath expression on the specified XML file and output the selected nodes or information according to the specified template or by copying them to the output.