awk -F, 'BEGIN{s=a=b=c=d=e=u=0;} {if($3>=90)s++; else if ($3>=80)a++; else if ($3>=70)b++; else if (43>=60)c++; else if ($3>=50)d++; else if($3>=40)e++; else u++;}END{print "S", s; print "A", a; print "B", b; print "C", c; print "D", d; print "E", e; print "U", u;}' id-name-marks.csv >histo.csv
gnuplot histo.gnuplot
display histo.png &