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  1. or download this
    echo $x | sed "s/^[^0-9]*\([0-9]*[.]*[0-9]*\)[^0-9A-Z]*GB.*/\1/g"
  2. or download this
    echo $x | sed "s/.\+ \([0-9]\+\)GB.*/\1/g"
  3. or download this
    echo $x | perl -ple 's/.+?(\d+)\s?GB.*/$1/'