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Thanks for that it's worked a treat!! Just one question... does:

nr=NR%40

just dictate that the first set of 40 lines should be processed first, and subsequent sets after?

Do you mean by echo-ing/printing the selected line range, feeding that into the above program and then appending the output to another file?

Cheers :)

Hi, I've written the following code to manipulate the first 40 lines of a data file into my desired order:

#!/bin/awk -f
{ if (NR<=(4)){
a[NR]=a[NR]$0" "}
else { if ((NR >= (5)) && (NR <=...

Ok that's brilliant thanks.

But what if the initial wavelengths sometimes varied, so you might get:

4862 x(1) y(1) z(1)
4958 x(1) y(1) z(1)
5007 x(1) y(1) z(1)
4860 x(2) y(2) z(2)
4959...

You could try typing...

ctrl-v ctrl-i

..for the tab character. I find this works.

Hello - is there any way in awk I can do...


4861 x(1) y(1) z(1)
4959 x(1) y(1) z(1)
5007 x(1) y(1) z(1)
4861 x(2) y(2) z(2)
4959 x(2) y(2) z(2)
5007 x(2) y(2) z(2)
4861 x(3) y(3) z(3)...