Most file managers, when you right-click on a file to bring up the context menu, offer a "decompress" option.
If they are *.tar files of any type (tar.gz, tar.bz2, etc.) files, tar -xvf [filename]
should work on the command line.
If they are *.rar files, you will need to find an unrar command if none is installed. See man unrar
. If there is no mah(ual) entry for unrar, it's a safe bet no "unrar" is installed.
For *.zip files, see man unzip
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