R help - May 2019 - The function sink() --delete everything before printing by "sink()"

I use the functions "sink" and "print" to print the results
to a txt file.
May I delete everything in the txt files before it start to print to the
txt file? Thanks!
#######
sink(file_output.txt"))
for(i in c("a", "b"))
{
  for(j in c("c", "d"))
  {
    {
      print(c(i,j))
      print(xyz1[[i,j]])
      print("t-stat")
      print(abc1[[i,j]])
    }
  }
}
sink()
#########

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?sink
 for the HELP page on that sink() function.
Check the description of the (optional) argument append to get an answer to
your question.

On Mon, May 6, 2019 at 5:24 AM John <miaojpm at gmail.com> wrote:
> I use the functions "sink" and "print" to print the
results to a txt file.
> May I delete everything in the txt files before it start to print to the
> txt file? Thanks!
> #######
> sink(file_output.txt"))
> for(i in c("a", "b"))
> {
>   for(j in c("c", "d"))
>   {
>     {
>       print(c(i,j))
>       print(xyz1[[i,j]])
>       print("t-stat")
>       print(abc1[[i,j]])
>     }
>   }
> }
> sink()
> #########
>
>         [[alternative HTML version deleted]]
>
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