Adding specific text and spaces to each line in a text file


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# 1  
Adding specific text and spaces to each line in a text file

Hi,

I wanted to add specific text to each row in a text file containing three rows. Example:

0 8 7 6 5 5
7 8 9 0 7 9
7 8 9 0 1 2

And I want to add a 21 at the beginning of the first row, and blank spaces at the beginning of the second two rows. To get this:

21 0 8 7 6 5 5
7 8 9 0 7 9
7 8 9 0 1 2

Thanks in advance!
# 2  
This is a clunky sed script to do what you want -
Code:
sed '1s/^/21 /;2s/^/ /;3s/^/ /' filename > newfilename

# 3  
With some basic commands:

Code:
echo -n '21 ';cat file > newfile

Regards
# 4  
using awk

awk '{if ( NR == 1 ){print 21,$0}else{print " " $0}}' name_of_file
# 5  
Thanks!
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