Re: tsort: "odd input of tokens" with paired input

[Alad Wenter]

On 06.04.2016 15:51, Assaf Gordon wrote:
> Hello,
>
> > On Apr 6, 2016, at 06:45, Michael V. Antosha <address@hidden> wrote:
> > On 4/6/16, Alad Wenter <address@hidden> wrote:
> > > Hello,
> > >
> > > When trying to run tsort on a moderately large
> > > paired list, I get:
> > >
> > > tsort: -: input contains an odd number of
> > > tokens
> > head -89 pre_tsort.txt | tsort  # success
> > # First 89 lines are okay.  Line 90 is bad.
> <shameless plug>
>
> The recent version of GNU Datamash ( http://gnu.org/s/datamash ) has a new 
> operation 'check' to quickly diagnose cases like this (non-tabular file 
> structure) and provide verbose report of the problem.
>
> Example:
>
>      $ curl -s https://ptpb.pw/c1Vu > test.txt
>      $ datamash -W check < test.txt
>      line 89 (2 fields):
>       cower cower
>      line 90 (3 fields):
>       deluge-labelplus deluge gtk2
>      datamash: check failed: line 90 has 3 fields (previous line had 2)
>
>
> The '-W' parameter tells datamash to use whitespace as field-separator (default 
> is tab).
> </shameless plug>
>
>
> regards,
>   - assaf
Thanks for the ideas. There were indeed some lines with a third field (I 
didn't expect a dependency which had a whitespace in its name...).

Using grep also works:

 % grep '.* .* .*' pre_tsort.txt
deluge-labelplus deluge gtk2
deluge-movetools deluge gtk2
deluge-smartmove deluge gtk2
deluge-stats deluge gtk2
deluge-webapi deluge gtk2

"datamash -W check" is nice to automate this, though I agree on having 
line-numbered errors for tsort. :)

Cheers,

Alad