Usage: xar -[ctx][v] -f <archive> ...
	-c               Creates an archive
	-x               Extracts an archive
	-t               Lists an archive
	-f <filename>    Specifies an archive to operate on [REQUIRED!]
	-v               Print filenames as they are archived
	-n name          Provides a name for a subdocument
	-s <filename>    On extract, specifies the file to extract
	                      subdocuments to.
	                 On archival, specifies an xml file to add
	                      as a subdocument.
	-l               On archival, stay on the local device.
	-p               On extract, set ownership based on symbolic
	                      names, if possible.
	-P               On extract, set ownership based on uid/gid.
	--toc-cksum      Specifies the hashing algorithm to use for
	                      xml header verification.
	                      Valid values: none, sha1, and md5
	                      Default: sha1
	--dump-toc=<filename> Has xar dump the xml header into the
	                      specified file.
	--dump-header    Prints out the xar binary header information
	--compression    Specifies the compression type to use.
	                      Valid values: none, gzip, bzip2
	                      Default: gzip
	--list-subdocs   List the subdocuments in the xml header
	--extract-subdoc=name Extracts the specified subdocument
	                      to a document in cwd named <name>.xml
	--exclude        POSIX regular expression of files to 
	                      ignore while archiving.
	--rsize          Specifies the size of the buffer used
	                      for read IO operations in bytes.
	--coalesce-heap  When archived files are identical, only store one copy
	                      This option creates an archive which
	                      is not streamable
	--link-same      Hardlink identical files
	--no-compress    POSIX regular expression of files
	                      to archive, but not compress.
	--version        Print xar's version number