cal -m 4 2001 | gawk -f cal01.awk


 Zeile  Felder           Inhalt
________________________________________

   1      2             April 2001
   2      7        Mo Di Mi Do Fr Sa So
   3      1                           1
   4      7         2  3  4  5  6  7  8
   5      7         9 10 11 12 13 14 15
   6      7        16 17 18 19 20 21 22
   7      7        23 24 25 26 27 28 29
   8      1        30

Bye.