How to produce ascii file from coast

Q&A
1

Is it possible to get some ascii text (vectors with some step)
from coast line and rivers
Following code asked me abou some system data
gmt begin map
gmt coast -R25.5/45.5/34.5/42.5 -JM6i -Gwhite -S0/200/255 -U -I9/0/0/255 -I1/0/0/255 -I2/0/0/255 -B | convert >some.data
gmt end show

2

See the purpose of the -M option in coast which will dump ascii data to stdout and make no plot.