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The admin section where it refers to .tar files is for templates, not themes. They work together but are not the same thing. Very few themes come with template sets.
To unzip in Linux, just use unzip from the command line. Here's the man page:
le="color: #000000"><?php UnZip 5.50 of 17 February 2002, by Info-ZIP. Maintained by C. Spieler. Send bug reports to the authors at Zip-Bugs@lists.wku.edu; see README for details. Usage: unzip [-Z] [-opts[modifiers]] file[.zip] [list] [-x xlist] [-d exdir] Default action is to extract files in list, except those in xlist, to exdir; file[.zip] may be a wildcard. -Z => ZipInfo mode ("unzip -Z" for usage). -p extract files to pipe, no messages -l list files (short format) -f freshen existing files, create none -t test compressed archive data -u update files, create if necessary -z display archive comment -x exclude files that follow (in xlist) -d extract files into exdir modifiers: -q quiet mode (-qq => quieter) -n never overwrite existing files -a auto-convert any text files -o overwrite files WITHOUT prompting -aa treat ALL files as text -j junk paths (do not make directories) -v be verbose/print version info -C match filenames case-insensitively -L make (some) names lowercase -X restore UID/GID info -V retain VMS version numbers -M pipe through "more" pager Examples (see unzip.txt for more info): unzip data1 -x joe => extract all files except joe from zipfile data1.zip unzip -p foo | more => send contents of foo.zip via pipe into program more unzip -fo foo ReadMe => quietly replace existing ReadMe if archive file newer
Hope this helps.