On Wed, 2 Oct 2002, Sudarshan Raghavan wrote:
> On Wed, 2 Oct 2002, John W. Krahn wrote:
>
> > "John W. Krahn" wrote:
> > >
> > > Sudarshan Raghavan wrote:
> > > >
> > > > On Wed, 2 Oct 2002, jontn_swift wrote:
> > > >
> > > > > This is a classic case for my favorite one-liner:
> > > > >
> > > > > perl -e'while(<>){print unless $seen{$_}++}' <infile >outfile
> > > >
> > > > You favourite one-liner can be even shorter
> > > > perl -n -e 'print unless $seen{$_}++' infile >outfile
> > >
> > > You want short? :-)
> > >
> > > perl -ne'$s{$_}++||print' infile >outfile
> >
> > Or if you want something a bit more obfuscated.
> >
> > perl -pe'$+{$_}++&&y+++cd' infile >outfile
> >
> > perl -pe'$s{$_}++&&s{.+}$$s' infile >outfile
>
> Thanks for that :-), learnt a couple of things in the process of
> understanding the second one.
At the risk of incurring the wrath of the list admin :-), to obfuscate the
second one a little more
perl -pe'$s{$_}++&&s{$_}++' infile >outfile
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