Padraig Brady wrote:
> Breathnach, Proinnsias (Dublin) wrote:
>>>>> to find all unique lines from both files:
>>>>>>>> sort [ab].txt | uniq -u
>>>>>>>>>> b.txt is a subset of a.txt in this case
>>> so your first eg is all that's required.
>>>>>> Padraig.
>>>>>>> Surely a sort -u [ab].txt
>> would suffice ... and save a pipe ?
>>> First of all sort shouldn't have -u
> as it breaks the unix philosophy. Well
> it is a bit cohesive so it's not too bad.
>> Anyway "sort -u" is the same as "sort | uniq"
> not "sort | uniq -u"
To put a mathematical slant on this,
from a set operations point of view:
uniq = union
uniq -u = difference
uniq -d = intersection
Also python is getting set operations
built into the language soon, wahoo!
http://www.python.org/peps/pep-0218.html
Padraig.
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