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sed to insert a character

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# 1  
Old 02-06-2013
sed to insert a character
Hi all,

I have a file like this
Code:
Q8N302
21-84
Q8N157
15-45
Q99996
167-201
202-251
269-318

I want to insert a character or space if the line starts with a number and I used the command
Code:
sed 's/^[0-9]/#/'

But in the output file, when it inserts this character, first digit in the number is deleted. How can I change the code so that I dont lose any digits. The output I am getting is given below

Code:
Q8N302
#1-84
Q8N157
#5-45
Q99996
#67-201
#02-251
#69-318
#20-321
#22-323

# 2  
Old 02-06-2013
Use '&' to insert matched string:

Code:
sed 's/^[0-9]/#&/'

# 3  
Old 02-07-2013
try also:
Code:
sed '/^[0-9]/s/^/#/'

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