# convert a plain txt data file with 3 numerical columns (x,y,z)
# into a valid xyz file
# commented lines in the original data file are omitted
# Known limitation: cannot work in a pipeline, needs a real input file
grep -v "^#" $1 | wc -l
echo "# converted from $1 by $0"
awk '/^[^#]/{print "C ",$0}' $1