Fixes @prefix counting (in case of 0) & adds new cmd 'nssort' & minor things

[hoijui]

No description provided.

[seebi]

Hi @elevont --- running your new command results in an error - can you fix this?

∴ rdf nssort
/Users/seebi/.local/bin/rdf: line 1048: prefixfile: unbound variable

[hoijui]

thank you @seebi !
should be fixed now.
(I before only tested the commands in the shell directly, instead of within the script, sorry :/ )

[seebi]

@hoijui Given this file

@prefix : <https://sebastian.tramp.name/>.
@prefix foaf: <http://xmlns.com/foaf/0.1/>.

: a foaf:Person .

@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix owl: <http://www.w3.org/2002/07/owl#>.
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.

I get this error:

∴ rdf nssort index.ttl
head: illegal line count -- -1

Any idea?

[hoijui]

Thanks for the testing! :-)
Apparently I was using head in a way that works on Linux but not on Mac.
It should now be fixed.