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Insert line

 
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# 1  
Old 03-24-2014
Insert line
Hello

Is there any sed command to insert a line after nth line... have a file of 500000 lines

Thanks
# 2  
Old 03-24-2014
Hello,

Here is an awk example for same, it may help.
For example an input file is:

Code:
1  5
2  4
3  3

Code is:
Code:
awk 'NR==2 {print "checking the insertion."} 1' file_name

Output will be as follows.

Code:
1  5
checking the insertion.
2  4
3  3


Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
Madiouma Ndiaye
# 3  
Old 03-24-2014
Insert line after every 7th line:
Code:
sed -n 'p;n;p;n;p;n;p;n;p;n;p;n;p;i\inserted line' file_1 >file_2

This User Gave Thanks to spacebar For This Post:
Madiouma Ndiaye
# 4  
Old 03-24-2014
Try sed with “i” command to insert a line before match for your request to add only one line.

Code:
$ cat file.txt
1
2
3
4
5

Code:
$  sed "4 i\Inserted new line" file.txt
1
2
3
Inserted new line
4
5

This User Gave Thanks to mjf For This Post:
Madiouma Ndiaye
# 5  
Old 03-28-2014
Thank you all for the replies

I ended up writing a small fortran code to do the insertion I was looking for by using
Code:
m = 90000
n = 288
do i = 1, m
 do j = 1, n
read() original file
write() to the new file
end do
insert line
enddo

Last edited by Scrutinizer; 03-28-2014 at 03:57 PM.. Reason: icode tags changed to code tags
 
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