How to append data to file with write function?

Question

I thought that snippet will do the trick:

f <- file("append2me.txt") write(1:5, ncolumns = 5, f) write(6:10, ncolumns = 5, f, append = T) close(f) f <- file("append2me.txt") print(readLines(f))

But the result is:

[1] "6 7 8 9 10"

Why is that?

Just to note, setting f as string works fine: f <- "append2me.txt" — zx8754
– zx8754, Commented Nov 22, 2022 at 11:59

zx8754 · Accepted Answer · 2022-11-22 12:17:43Z

It is about how we open the file:

f <- file("append2me.txt", open = "a") write(1:5, ncolumns = 5, file = f) write(6:10, ncolumns = 5, file = f) close(f) f1 <- file("append2me.txt", open = "r") readLines(con = f1) close(f1) # [1] "1 2 3 4 5" "6 7 8 9 10"

write is just a wrapper for cat, from cat manuals, see:

append logical. Only used if the argument file is the name of file (and not a connection or "|cmd"). If TRUE output will be appended to file; otherwise, it will overwrite the contents of file.

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