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It doesn't, it just does what it's told -- print each line into filename.

And since filename is calculated from the line number each line, the file name changes depending on the equation we just...

Try yourself. Run:awk 'BEGIN {for (i=1; i<=69; i++) print i, "filename" int((i-1)/34)".DAT"}'

if column 3 value is constant, use below code

awk '{newnum=sprintf ("%07.f", NR);sub("0000001",newnum,$0)}1' filename

Please use code tags, not icode tags.

Try awk '{$3=sprintf ("%07.f", NR)}1' file
ASDSD ADSD 0000001 X
AAASD ADSD 0000002 X
SDDDD ADSD 0000003 X

Hi mate,
I guess you mean *line* length? If the file has only one long line, you could try this:
yes "`<input.dat`" | head
If it works for you, then run this:
yes "`<input.dat`" | head -n 1000000...

tryvar="100234 XHYSDDS SDSD"
nawk -v var="$var" 'BEGIN { for ( i = 1; i <=1000000; i++ ) { print var}}'

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