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Listing numeric strings alone

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# 1  
Java Listing numeric strings alone

i have a file called 'test.txt' which contains the below data.


From the above data, i want to display the line which contains only numeric [0-9]. So i have tried the below commands with sed

sed -n '/^[0-9]$/p' test.txt
sed '/^[0-9]$/!d' test.txt

But it doesn't work as expected.
Please help me to achieve this


Last edited by pludi; 07-29-2011 at 04:03 AM..
# 2  
sed -n '/^[0-9][0-9]*$/p' test.t

# 3  
Originally Posted by yazu
sed -n '/^[0-9][0-9]*$/p' test.t

May i know what's the difference between sed -n '/^[0-9][0-9]*$/p' test.t and sed -n '/^[0-9]*$/p' test.t

In the first one no empty line is returned at the end.
In the second one, there is an empty line is returned at the end

May i know why?

# 4  
'(ANITHING)*' means 0 or more matches with ANITHING. So it matches with an empty string.
# 5  
Thanks Yazu!!
It works great!

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