sed syntax

[Jamon Camisso]

Matt Price wrote:
>>> How about:
>>>
>>> sed 's/.*block \([0-9]*\)$/\1/'
>>>
> hmm, that also seems to just return the same data unprocessed.
> 
> 
>>  
>>> I think the main problem was you failed to escape the ()'s which sed
>>> requires.
>>>
>> Sed works, but awk is designed for just the task you're attempting:
>> cat file.txt | awk '{print $10}'
>>
> cool.   what if there weren't always 10 fields?  is there a
> straightforward awk way to just get the final numerical expression?

Try '{print $NF}'.

Even better:
awk '/I\/O error/ {print $NF}' file.txt

The part between the / / is for regexes, escaped as usual (like I\/O
instead of I/O) using a \.

Jamon
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