Hi,
I have tried to implement the wish [1] (now in CVS). The module
v.extract supports also reverse selection. Category numbers/ranges can
be also read from stdin, e.g.
echo -e "1-2\n3" | v.extract in=roads out=x file=-
v.category x opt=print | sort | uniq
1
2
3
echo -e "1-2\n3" | v.extract in=roads out=x file=- -r
v.category x opt=print | sort | uniq
4
5
Martin
[1] https://intevation.de/rt/webrt?serial_num=2780&display=History
--
Martin Landa <landa.martin@gmail.com> * http://gama.fsv.cvut.cz/~landa *