[R] add text to the first line of an output file

[YIHSU CHEN]

Hi guys;

I want to write some text at the first line of an output file.  The output
file will be used for other software.  In particular, the following text
"ampl.tab 2 1" needs to be added to the first line of an  df output file.
As a hypothetic example, the output in text file should be like:

ampl.tab 2 1
A  B
2   3
4   6
2   0

Thanks for help.

Yihsu

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