       keylget listvar ?key? ?retvar | {}?
              Return the value associated with key from the keyed
              list in the variable listvar.   If  retvar  is  not
              specified,  then  the value will be returned as the
              result of the command.  In this case, if key is not
              found in the list, an error will result.

              If retvar is specified and key is in the list, then
              the value is returned in the  variable  retvar  and
              the command returns 1 if the key was present within
              the list.  If key ise  file  specified by fileId, starting from
              the current file position.  Check all  patterns  in
              the scan context specified by contexthandle against
              it, executing the match commands  corresponding  to
              patterns matched.

              If  the  optional  -copyfile argument is specified,
              the next argument is a file ID to which  all  lines
              not  matched  by any patter