XMLStarlet is a set of command line utilities (tools) which can be used to transform, query, validate, and edit XML documents and files using simple set of shell commands in similar way it is done for plain text files using UNIX grep, sed, awk, diff, patch, join, etc commands.
This set of command line utilities can be used by those who deal with many XML documents on UNIX shell command prompt as well as for automated XML processing with shell scripts.
XMLStarlet command line utility is written in C and uses libxml2 and libxslt from http://xmlsoft.org/. Implementation of extensive choice of options for XMLStarlet utility was only possible because of rich feature set of libxml2 and libxslt (many thanks to the developers of those libraries for great work).
'diff' and 'patch' options are not currently implemented. Other features need some work too. Please, send an email to the project administrator (see http://sourceforge.net/projects/xmlstar/) if you wish to help.
XMLStarlet is linked statically to both libxml2 and libxslt, so generally all you need to process XML documents is one executable file. To run XmlStarlet utility you can simple type 'xml' on command line and see list of options available.
XMLStarlet is open source freeware under MIT license which allows free use and distribution for both commercial and non-commercial projects.
We welcome any user's feedback on this project which would greatly help us to improve its quality. Comments, suggestions, feature requests, bug reports can be done via SourceForge project web site (see XMLStarlet Sourceforge forums, or XMLStarlet mailing list)