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Replace FS with RS.

$ awk '{for (i=1;i<=NF;i++) if (i<=NR) printf $i FS}' infile
1 0 8 9 2 6 6 8 9 6 7 9 4 9 9 9 0 3 4 7 9

$ awk '{for (i=1;i<=NF;i++) if (i<NR) printf $i FS}' infile
0 9 2 6 8 9 7 9 4 9 9 0 3 4 7

Assuming that your version of awk has lots of memory and no limits on output line lengths, your system has a LARGE value for ARG_MAX, and that your shell doesn't limit the number of arguments you can...