Writes a data.frame to tabular text file with an optional header.
# S3 method for data.frame
writeDataFrame(data, file, path=NULL, sep="\t", quote=FALSE, row.names=FALSE,
  col.names=!append, ..., header=list(), createdBy=NULL,
  createdOn=format(Sys.time(), format = "%Y-%m-%d %H:%M:%S %Z"),
  nbrOfRows=nrow(data), headerPrefix="# ", headerSep=": ", append=FALSE, overwrite=FALSE)A data.frame.
A connection or a filename to write to.
The directory where the file will be written.
Additional arguments
    passed to write.table.
If non-NULL, common header
    rows to be added to the header.
A character string specifying the prefix of each
    header row.
A character string specifying the character
    separating the header name and header values.
If TRUE, the output is appended to an existing file.
If TRUE, an existing file is overwritten.
Returns (invisibly) the pathname to the file written
  (or the connection written to).
write.table.
 readTable().