gistfile1.sh

relevant section of curl manpage : 
  -d/--data <data>
              (HTTP)  Sends  the  specified data in a POST request to the HTTP
              server, in the same way that a browser  does  when  a  user  has
              filled  in an HTML form and presses the submit button. This will
              cause curl to pass the data to the server using the content-type
              application/x-www-form-urlencoded.  Compare to -F/--form.

              -d/--data  is  the  same  as  --data-ascii.  To post data purely
              binary, you should instead use the --data-binary option. To URL-
              encode the value of a form field you may use --data-urlencode.

              If  any of these options is used more than once on the same com-
              mand line, the data pieces specified  will  be  merged  together
              with  a  separating  &-symbol.  Thus,  using  '-d name=daniel -d
              skill=lousy'  would  generate  a  post  chunk  that  looks  like
              'name=daniel&skill=lousy'.

              If  you  start  the data with the letter @, the rest should be a
              file name to read the data from, or - if you want curl  to  read
              the  data  from stdin.  The contents of the file must already be
              URL-encoded. Multiple files can also be specified. Posting  data
              from  a file named 'foobar' would thus be done with --data @foo-
              bar.


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curl --data-ascii "search_term=Potenza 960 225/45/17" -d "do=search" -d "nodecide=true" "http://www.bestusedtires.com/search-exec/"