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output only numbers from mixed string

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# 1  
Old 08-29-2006
output only numbers from mixed string
it must be late because I'm sure this is an easy task with grep sed or awk

string would be anything mixing numbers letters and ) ( =

output I need is just the numbers... but I just can't seem to get it to work.

Any tips would be great Smilie
# 2  
Old 08-29-2006
Code:
echo '12sj5(+_=23' | sed 's/[^0-9]//g'

# 3  
Old 08-29-2006
ahh thanks, I spent a few hours trying to get this to work and even had a similar line in there at one time experimenting. Thanks heaps.
# 4  
Old 08-29-2006
try tr
Code:
echo "abc12345" | tr -cd [0-9]

--not tested though..
Last edited by ranj@chn; 08-29-2006 at 08:49 AM.. Reason: add comments
# 5  
Old 08-29-2006
tr is quite good, do a man on tr and you can do heaps...
# echo "abcd1234" | tr -d [:digit:]
# 1234
You can check for control chars the lot.
# 6  
Old 08-29-2006
Quote:
Originally Posted by Andrek
tr is quite good, do a man on tr and you can do heaps...
# echo "abcd1234" | tr -d [:digit:]
# 1234
You can check for control chars the lot.
Actually the output of that would be abcd, not 1234
# 7  
Old 08-29-2006
Ranj, I am curious. How could I specify for example...

Code:
echo "abc12FG345" | tr -cd [a-z][A-Z]

if I wanted to not delete more than one range, I've played with this a bit but can't find the syntax for such a thing.
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