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  1. or download this
    $ perl -wle '$_=shift; /\S+\s+(\S+)/ and print $1' ".declare cube_no  
+      9999999.999"
cube_no
  2. or download this
    $ perl -wle '$_=shift; print +(split)[1]' ".declare cube_no        999
+9999.999"
cube_no