Without example data, it's not completely clear what you are trying to do.
But this might be one of many ways to accomplish what you are trying to do:
$ { head -4 test.dat ; sed -n 3p w.dat ; tail -n +5 test.dat ; } | cat -n
1 b1
2 b2
3 b3
4 b4
5 a3
6 b5
7 b6
8 b7
9 b8
10 b9
11 b10
Sample data:
$ paste w.dat test.dat | cat -n
1 a1 b1
2 a2 b2
3 a3 b3
4 a4 b4
5 a5 b5
6 a6 b6
7 a7 b7
8 a8 b8
9 a9 b9
10 a10 b10
Regards,
- Robert
On Mon, Jan 4, 2021 at 8:02 AM [email protected] <[email protected]>
wrote:
> Hi,
> I want to copy a line from a file to a specific line number in a file.
>
> I copy line 3 from w.dat file to test.dat file using
>
> sed -n 3P w.dat >> test.dat
>
> but it copy line 3 to the end of test.dat file, I want copy line 3 to line
> number 5 in the test.dat file, how can I do that?
>
>
>
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