[GRASS-user] problems with v.edit - merge

[G. Allegri]

I can't figure out how to solve a problem with a line feature shapefile I
have. It has been wrongly created as 81 single lines touching each other
with their vertexes. I need to merge the lines into a unique line. I've
tried with v.edit and the merge tool, two times. First time it gave me 32
lines, the second I receive the following result:

1 of 4 features selected from vector map <costa at PERMANENT>

Only 1 lines found, at least two needed

-1 lines merged
Building topology ...
Registering lines:
4 primitives registered
Building areas:

0 areas built
0 isles built
Attaching islands:
Attaching centroids:

Topology was built.
Number of nodes     :   5
Number of primitives:   4
Number of points    :   0
Number of lines     :   4
Number of boundaries:   0
Number of centroids :   0
Number of areas     :   0
Number of isles     :   0

v.edit complete.

I can't understand what it means: it says it selected 4 lines but then just
1 line has been found. the post build report lists 4 lines... I'm a bit
confused.
I've manually merged all the categories too with v.digit, but nothing seems
to change (neither better nor worst!).

What am I doing wrong? What's the best method to achieve my task?

Thanks,
Giovanni
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