Re: [PLUG] Using diff

[Fred Stluka via plug <plug@lists.phillylinux.org>]

Martin,

Good tip!  I've used uniq forever, but forgot about (or never knew)
the -u option.  Good stuff!

--Fred
------------------------------------------------------------------------
Fred Stluka -- http://bristle.com -- Glad to be of service!
Open Source: Without walls and fences, we need no Windows or Gates.
------------------------------------------------------------------------

On 5/27/21 8:53 PM, Martin Dellwo via plug wrote:
> If you know one list contains the other entirely, and neither has its 
> own repetitions, ‘sort first second | uniq -u’ oughta work just fine.
>
> Martin Dellwo
> /martin.dellwo@gmail.com/
>
> > On May 27, 2021, at 8:29 PM, Walt Mankowski via plug 
> > <plug@lists.phillylinux.org> wrote:
> >
> > I usually end up doing this in Perl or Python. The diff solution is
> > nice. If you're interested, I've attached a little Perl script I just
> > whipped up. It has the advantage of not requiring the lists to be
> > sorted.
> >
> > Then I wrote a Python version, too. :)
> >
> > Walt
> >
> > On Thu, May 27, 2021 at 07:36:05PM -0400, Michael Lazin via plug wrote:
> > > Awesome, thanks!   Comm got the job done in a pinch but I am going 
> > > to try
> > > diff tomorrow morning.  Thanks again for your help.
> > >
> > > Sincerely,
> > >
> > > Michael Lazin
> > >
> > > On Thu, May 27, 2021, 6:01 PM Carlos M. Fernández 
> > > <aremmes@gmail.com> wrote:
> > >
> > > > This has worked for me before:
> > > >
> > > > diff -Nau first second | grep '^+'
> > > >
> > > > This assumes that first and second are sorted.
> > > >
> > > > On Thu, May 27, 2021, 17:37 Michael Lazin via plug <
> > > > plug@lists.phillylinux.org> wrote:
> > > >
> > > > > I used the sort command to make two lists.  One list has everything on
> > > > > the first list and more.  They are already alphabetically sorted. 
> > > > >  I want
> > > > > to know what is on the second list that is not on the first list. 
> > > > >  I am
> > > > > trying to use diff but perhaps there is a better way.   I tried 
> > > > > awk and an
> > > > > ugly egrep and now I am giving up and asking for help.  Thanks for 
> > > > > your
> > > > > time.
> > > > >
> > > > > Sincerely,
> > > > >
> > > > > Michael Lazin
> > > > >
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> > <not_in_first.pl>
> > <not_in_first.py>
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