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Shell Programming and Scripting

print lines containing only numbers

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# 1  
Old 09-06-2011
print lines containing only numbers
Hi boys,
I have a txt file with a lot of lines.
It have lines containing mostly only numbers but some of them contain numbers mixed with special characters and or letters or space..
its look like this:

Code:
271261621371
2727127f
27126|71372.

...
Do you have any ideas of the easiest way to extract only lines containing numbers? I know its not so complicated but I am stuck on that for an hour.. and still can't find a good way to solve it.
All lines are not equal.. different length. All I need is to grep only lines with ONLY numbers.

Thanks in advance!
Last edited by radoulov; 09-06-2011 at 08:18 AM.. Reason: Code tags.
# 2  
Old 09-06-2011
Code:
egrep -x '[0-9]+'

# 3  
Old 09-06-2011
Thanks yazu, egrep works perfect..
I just figured out I should strings file first..
Thank you again !
# 4  
Old 09-06-2011
Quote:
egrep -v [a-zA-Z] <filename>
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