DragonFly On-Line Manual Pages
LPTEST(1) DragonFly General Commands Manual LPTEST(1)
lptest -- generate lineprinter ripple pattern
lptest [length] [count]
The lptest utility writes the traditional "ripple test" pattern on stan-
dard 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
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 be also be specified.
A lptest utility appeared in 4.3BSD.
DragonFly 4.9 December 30, 1993 DragonFly 4.9