On Thursday 13 September 2007 20:19, Kurt Buff wrote:
> On 9/13/07, Jerry McAllister <[EMAIL PROTECTED]> wrote:
> > > The only space is the one separating the SMTP address from the OK or
> > > NO.
> >
> > Then you should be able to tell it to sort on the first token in
> > the string with white space as a separator and to eliminate
> > duplicates.   It has been a long time since I had need of sort. I
> > don't remember the arguments/flags but am sure that type of thing can be
> > done.

You can use uniq if the file is already sorted (if not, put a sort at the 
start of the pipe) - after using awk to pick the first field:

awk '{print $1}' inputfile | uniq -u

> Ya know, it's really easy to get wrapped around the axle on this stuff.
> I think I may have a better solution. The file I'm trying to massage
> has a predecessor - the non-unique lines are the result of a
> concatenation of two files.
> Silly me, it's better to 'grep -v' with the one file vs. the second
> rather than trying to merge, sort and further massage the result. The
> fix will be to use sed against the first file to remove the ' NO',
> thus providing a clean argument for grepping the other file.

If it's two files and you want to select or reject common lines, look at 
comm(1) as another technique.

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