add text to the first line of an output file

He wants to prepend, not append.

On 22 October 2014 11:04, Henrik Bengtsson <hb at biostat.ucsf.edu> wrote:

You can! Open a file connection and write to that. Whatever write

commands

you use will append to the output. Don't forget to close the connection

at

the end. See ?file

Henrik

On Oct 22, 2014 12:33 AM, "Sven E. Templer" <sven.templer at gmail.com>

wrote:

Hi.

You can't.

But using a second file where you first write your header and then
append the original file is a solution. ?cat and ?write.table with a
focus on the 'append' argument should help. you can then use ?unlink
to delete the original file and ?file.rename to rename the second, if
desired.

Best, Sven.

On 22 October 2014 02:32, YIHSU CHEN <yihsuc at gmail.com> wrote:

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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