How to add a data column in existing file

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Operating Systems Linux Ubuntu How to add a data column in existing file
# 1  
Old 04-22-2012
How to add a data column in existing file

Hi All

I need to add a column on my existing data file. I know similar posts are there but none of them were meeting my requirement. My input is

1.20 3.44 4.88
5.11 4.99 3.22
1.89 3.89 2.90

Desired output

1 1.20 3.44 4.88
2 5.11 4.99 3.22
3 1.89 3.89 2.90

I will highly appreciate your cordial help.

Thank you.
# 2  
Old 04-22-2012
You can "cheat" by putting two columns in one.

awk '{ $1=NR" "$1 } 1' filename

This User Gave Thanks to Corona688 For This Post:
# 3  
Old 04-22-2012
Thanks Corona, that works fine...
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