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how to print out line numbers of a text file?

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# 1  
Old 12-12-2005
how to print out line numbers of a text file?
i have this text file name test.txt which contain :
aaaaa bbb
iiiiiiiiiiiii ccf
ddaaa ddd

and i need a script that can print out the line numbers using a while loop..
so when the script is run..it will have this:
1
2
3

any ideas? Smilie thanks guys
# 2  
Old 12-12-2005
I think the below sed command will help you

sed -n '=' datafile
# 3  
Old 12-12-2005
thanks again for great help! solve part of my problem already..thanks...
# 4  
Old 12-12-2005
cat -n <filename>|awk '{print $1}'

should help
# 5  
Old 12-12-2005
thanks very much!
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