sed: Remove All Except Digits (Numbers) From Input

by on August 19, 2006 · 2 comments· LAST UPDATED August 19, 2009

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How do I remove all (text, special characters, white spaces, tabs etc) from my text file (input) except numbers (digits) using sed command?

You need to use simple regular expression to remove all but numbers from the input. For example, 's/^[0-9]*//g' will remove all but numbers from the input. Type the following command:
$ echo 'This is a test. 123456789 and 2nd number is 34. 3M3i4x5' | sed 's/[^0-9]*//g'
You can remove all except digits from a text file:

sed 's/[^0-9]*//g' input.txt
sed 's/[^0-9]*//g' input.txt > output.txt
sed -i 's/[^0-9]*//g' input.txt
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{ 2 comments… read them below or add one }

1 Kashif January 25, 2012 at 11:38 am

Good but if I want to delete only numbers (randomly).
Input 1:
I am 89 years old.
Output 1:
I am years old.
And
Input 2:
I am 2012 years old.
Output 2:
I am 9 years old.

Thanks

Reply

2 Kashif January 25, 2012 at 12:32 pm

I have figured it out. I just removed ^. But if the word contains like 82age or age10 than how it would be possible to remove only numbers.

Thanks

Reply

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