def extract_cmd(filepath, overwrite=False):
    """
    Determines the file type of file at filepath, returns extract cmd based on file suffix
    """
    filename = os.path.basename(filepath)
    exts = [x.lower() for x in filename.split('.')]
    target = '.'.join(exts[:-1])
    cmd_tmpl = None

    extract_cmds = {
    # gzipped or gzipped tarball
    '.gz':      "gunzip -c %(filepath)s > %(target)s",
    '.tar.gz':  "tar xzf %(filepath)s",
    '.tgz':     "tar xzf %(filepath)s",
    '.gtgz':    "tar xzf %(filepath)s",
    # bzipped or bzipped tarball
    '.bz2':     "bunzip2 %(filepath)s",
    '.tar.bz2': "tar xjf %(filepath)s",
    '.tbz':     "tar xjf %(filepath)s",
    '.tbz2':    "tar xjf %(filepath)s",
    '.tb2':     "tar xjf %(filepath)s",
    # xzipped or xzipped tarball
    '.xz':      "unxz %(filepath)s",
    '.tar.xz':  "unxz %(filepath)s --stdout | tar x",
    '.txz':     "unxz %(filepath)s --stdout | tar x",
    # tarball
    '.tar':     "tar xf %(filepath)s",
    # zip file
    '.zip':     "unzip -qq -o %(filepath)s" if overwrite else "unzip -qq %(filepath)s",
    # iso file
    '.iso':     "7z x %(filepath)s",
    }

    for i in extract_cmds.keys():
        if filename[-len(i):] == i:
            cmd_tmpl=extract_cmds[i]

    if cmd_tmpl is None:
        raise EasyBuildError('Unknown file type for file %s (%s)', filepath, exts)

    return cmd_tmpl % {'filepath': filepath, 'target': target}