[GRASS-user] How to convert from point to line ?

[SGW00412 at nifty.com]

Dear all

I am a beginner user of grass gis.

I want to import a text file that included latitude, longitude,ID number and 
recordig time, into grass as line data.

The format style is as follows:

id,x,y,time
1,857.8629761,-785.6849976,1
1,987.9949951,-682.4140015,2
1,964.4849854,-710.6849976,3
2,1689.578979,-1070.564941,4
2,1654.074951,-1061.333008,5
2,1618.218018,-1040.505981,6
3,2335.930908,-1180.246948,7
3,2336.694092,-1197.869019,8
3,2336.658936,-1218.124023,9
4,2512.673096,-1689.875977,10
4,2494.010986,-1710.625977,11
5,1826.724976,-1731.743042,12
5,1808.57605,-1726.490967,13
5,1793.598999,-1723.034058,14
.....
.....
.....
.....


Firstly I intended to use 'v in ascii' command.

However, this command imports a text data into points, I think.

I want to import this text file into grass as line data according to the ID 
number.

May this question be solved in grass? If it is so, please teach a solution....

Yasuo shimada: Japan weather assocation.