xmllint — command line XML tool


xmllint [[--version] | [--debug] | [--shell] | [--debugent] | [--copy] | [--recover] | [--noent] | [--noout] | [--htmlout] | [--nowrap] | [--valid] | [--postvalid] | [--dtdvalid URL] | [--timing] | [--repeat] | [--insert] | [--compress] | [--html] | [--push] | [--memory] | [--nowarning] | [--noblanks] | [--format] | [--testIO] | [--encode encoding] | [--catalogs] | [--nocatalogs] | [--auto] | [--xinclude] | [--loaddtd] | [--dtdattr] | [--dropdtd] | [--stream] | [--chkregister] | [--relaxng] | [--schema] | [--nonet]] [xmlfile]


The xmllint program parses one or more XML files, specified on the command line as xmlfile. It prints various types of output, depending upon the options selected. It is useful for detecting errors both in XML code and in the XML parser itself.

It is included in libxml2.


Display the version of libxml2 used.
Parse a file and output an annotated tree of the in-memory version of the document.
Run a navigating shell. Details on available commands in shell mode are below.
Debug the entities defined in the document.
Test the internal copy implementation.
Output any parsable portions of an invalid document.
Substitute entity values for entity references. By default, xmllint leaves entity references in place.
Suppress output. By default, xmllint outputs the result tree.
Output results as an HTML file. This causes xmllint to output the necessary HTML tags surrounding the result tree output so the results can be displayed in a browser.
Do not output HTML doc wrapper.
Determine if the document is a valid instance of the included Document Type Definition (DTD). A DTD to be validated against also can be specified at the command line using the --dtdvalid option. By default, xmllint also checks to determine if the document is well-formed.
Validate after parsing is completed.
--dtdvalid URL
Use the DTD specified by URL for validation.
Output information about the time it takes xmllint to perform the various steps.
Repeat 100 times, for timing or profiling.
Test for valid insertions.
Turn on gzip compression of output.
Use the HTML parser.
Use the push mode of the parser.
Parse from memory.
Do not emit warnings from the parser and/or validator.
Drop ignorable blank spaces.
Reformat and reindent the output. The $XMLLINT_INDENT environment variable controls the indentation (default value is two spaces " ").
Test user input/output support.
--encode encoding
Output in the given encoding.
Use the catalogs from $SGML_CATALOG_FILES. Otherwise /etc/xml/catalog is used by default.
Do not use any catalogs.
Generate a small document for testing purposes.
Do XInclude processing.
Fetch external DTD.
Fetch external DTD and populate the tree with inherited attributes.
Remove DTD from output.
Use streaming API - useful when used in combination with --relaxng or --valid options for validation of files that are too large to be held in memory.
Turn on node registration. Useful for developeres testing libxml2 node tracking code.
--relaxng schema
Use RelaxNG file named schema for validation.
--schema schema
Use a W3C XML Schema file named schema for validation.
Do not use the Internet to fetch DTD's or entities.


xmllint offers an interactive shell mode invoked with the --shell command. Available commands in shell mode include:

display XML base of the node
leave shell
cat node
Display node if given or current node.
cd path
Change the current node to path (if given and unique) or root if no argument given.
dir path
Dumps information about the node (namespace, attributes, content).
du path
Show the structure of the subtree under path or the current node.
Leave the shell.
Show this help.
Display memory usage.
load name
Load a new document with the given name.
ls path
List contents of path (if given) or the current directory.
Display the path to the current node.
Leave the shell.
save name
Saves the current document to name if given or to the original name.
Check the document for error.
write name
Write the current node to the given filename.

Debugging Catalogs

Setting the environment variable XML_DEBUG_CATALOG using the command "export XML_DEBUG_CATALOG=" outputs debugging information related to catalog operations.