generate lineprinter ripple pattern
lptest writes the traditional “ripple
test” pattern on standard output. In 96 lines, this pattern will print
all 96 printable ASCII characters in each position. While originally created
to test printers, it is quite useful for testing terminals, driving terminal
ports for debugging purposes, or any other task where a quick supply of random
data is needed.
The length argument specifies the output
line length if the default length of 79 is inappropriate.
The count argument specifies the number of
output lines to be generated if the default count of 200 is inappropriate.
Note that if count is to be specified,
length must also be specified.
lptest appeared in 4.3BSD.