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download PDF document: xmllint.1.pdf

XMLLINT(1) xmllint Manual XMLLINT(1)
NAME xmllint - command line XML tool
SYNOPSIS xmllint [--version | --debug | --shell | --xpath "XPath_expression" | --debugent | --copy | --recover | --noent | --noout | --nonet | --path "PATH(S)" | --load-trace | --htmlout | --nowrap | --valid | --postvalid | --dtdvalid URL | --dtdvalidfpi FPI | --timing | --output FILE | --repeat | --insert | --compress | --html | --xmlout | --push | --memory | --maxmem NBBYTES | --nowarning | --noblanks | --nocdata | --format | --encode ENCODING | --dropdtd | --nsclean | --testIO | --catalogs | --nocatalogs | --auto | --xinclude | --noxincludenode | --loaddtd | --dtdattr | --stream | --walker | --pattern PATTERNVALUE | --chkregister | --relaxng SCHEMA | --schema SCHEMA | --c14n] {XML-FILE(S)... | -}
xmllint --help
DESCRIPTION The xmllint program parses one or more XML files, specified on the command line as XML-FILE (or the standard input if the filename provided is - ). 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.
xmllint is included in libxml(3).
OPTIONS xmllint accepts the following options (in alphabetical order):
--auto Generate a small document for testing purposes.
--catalogs Use the SGML catalog(s) from SGML_CATALOG_FILES. Otherwise XML catalogs starting from /usr/local/share/xml/catalog are used by default.
--chkregister Turn on node registration. Useful for developers testing libxml(3) node tracking code.
--compress Turn on gzip(1) compression of output.
--copy Test the internal copy implementation.
--c14n Use the W3C XML Canonicalisation (C14N) to serialize the result of parsing to stdout. It keeps comments in the result.
--dtdvalid URL Use the DTD specified by an URL for validation.
--dtdvalidfpi FPI
--debugent Debug the entities defined in the document.
--dropdtd Remove DTD from output.
--dtdattr Fetch external DTD and populate the tree with inherited attributes.
--encode ENCODING Output in the given encoding. Note that this works for full document not fragments or result from XPath queries.
--format Reformat and reindent the output. The XMLLINT_INDENT environment variable controls the indentation. The default value is two spaces " ").
--help Print out a short usage summary for xmllint.
--html Use the HTML parser.
--htmlout 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/viewed in a browser.
--insert Test for valid insertions.
--loaddtd Fetch an external DTD.
--load-trace Display all the documents loaded during the processing to stderr.
--maxmem NNBYTES Test the parser memory support. NNBYTES is the maximum number of bytes the library is allowed to allocate. This can also be used to make sure batch processing of XML files will not exhaust the virtual memory of the server running them.
--memory Parse from memory.
--noblanks Drop ignorable blank spaces.
--nocatalogs Do not use any catalogs.
--nocdata Substitute CDATA section by equivalent text nodes.
--noent Substitute entity values for entity references. By default, xmllint
--nowarning Do not emit warnings from the parser and/or validator.
--nowrap Do not output HTML doc wrapper.
--noxincludenode Do XInclude processing but do not generate XInclude start and end nodes.
--nsclean Remove redundant namespace declarations.
--output FILE Define a file path where xmllint will save the result of parsing. Usually the programs build a tree and save it on stdout, with this option the result XML instance will be saved onto a file.
--path "PATH(S)" Use the (space- or colon-separated) list of filesystem paths specified by PATHS to load DTDs or entities. Enclose space-separated lists by quotation marks.
--pattern PATTERNVALUE Used to exercise the pattern recognition engine, which can be used with the reader interface to the parser. It allows to select some nodes in the document based on an XPath (subset) expression. Used for debugging.
--postvalid Validate after parsing has completed.
--push Use the push mode of the parser.
--recover Output any parsable portions of an invalid document.
--relaxng SCHEMA Use RelaxNG file named SCHEMA for validation.
--repeat Repeat 100 times, for timing or profiling.
--schema SCHEMA Use a W3C XML Schema file named SCHEMA for validation.
--shell Run a navigating shell. Details on available commands in shell mode are below (see the section called "SHELL COMMANDS").
--xpath "XPath_expression" Run an XPath expression given as argument and print the result. In case of a nodeset result, each node in the node set is serialized in full in the output. In case of an empty node set the "XPath set is empty" result will be shown and an error exit code will be returned.

--timing Output information about the time it takes xmllint to perform the various steps.
--valid 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.
--version Display the version of libxml(3) used.
--walker Test the walker module, which is a reader interface but for a document tree, instead of using the reader API on an unparsed document it works on an existing in-memory tree. Used for debugging.
--xinclude Do XInclude processing.
--xmlout Used in conjunction with --html. Usually when HTML is parsed the document is saved with the HTML serializer. But with this option the resulting document is saved with the XML serializer. This is primarily used to generate XHTML from HTML input.
SHELL COMMANDS xmllint offers an interactive shell mode invoked with the --shell command. Available commands in shell mode include (in alphabetical order):
base Display XML base of the node.
bye Leave the shell.
cat NODE Display the given node or the current one.
cd PATH Change the current node to the given path (if unique) or root if no argument is given.
dir PATH Dumps information about the node (namespace, attributes, content).
du PATH Show the structure of the subtree under the given path or the current node.
exit Leave the shell.
help
ls PATH List contents of the given path or the current directory.
pwd Display the path to the current node.
quit Leave the shell.
save FILENAME Save the current document to the given filename or to the original name.
validate Check the document for errors.
write FILENAME Write the current node to the given filename.
ENVIRONMENT SGML_CATALOG_FILES SGML catalog behavior can be changed by redirecting queries to the user's own set of catalogs. This can be done by setting the SGML_CATALOG_FILES environment variable to a list of catalogs. An empty one should deactivate loading the default /usr/local/share/sgml/catalog catalog.
XML_CATALOG_FILES XML catalog behavior can be changed by redirecting queries to the user's own set of catalogs. This can be done by setting the XML_CATALOG_FILES environment variable to a space-separated list of catalogs. Use percent-encoding to escape spaces or other characters. An empty variable should deactivate loading the default /usr/local/share/xml/catalog catalog.
XML_DEBUG_CATALOG Setting the environment variable XML_DEBUG_CATALOG to non-zero using the export command outputs debugging information related to catalog operations.
XMLLINT_INDENT Setting the environment variable XMLLINT_INDENT controls the indentation. The default value is two spaces " ".
DIAGNOSTICS xmllint return codes provide information that can be used when calling it from scripts.
0 No error
1 Unclassified
2 Error in DTD
3
6 Error writing output
7 Error in pattern (generated when --pattern option is used)
8 Error in Reader registration (generated when --chkregister option is used)
9 Out of memory error
10 XPath evaluation error
SEE ALSO libxml(3)
More information can be found at
o libxml(3) web page https://gitlab.gnome.org/GNOME/libxml2

AUTHORS John Fleck <jfleck@inkstain.net> Author.
Ziying Sherwin <sherwin@nlm.nih.gov> Author.
Heiko Rupp <hwr@pilhuhn.de> Author.
COPYRIGHT Copyright (C) 2001, 2004
libxml2 08/17/2022 XMLLINT(1)