gauss 21> tdvfrom
 usage: tdvfrom <file name>

        Use 'tdvfrom -' to read from standard input

gauss 22> tdvfrom -
1
2
3
4
5
^D
 tdvfrom:            5 read from -

gauss 23> tdvfrom < first100
 tdvfrom:          100 read from first100