libio-tee-perl - 0.66-1 main

IO::Tee objects can be used to multiplex input and output in two
different ways. The first way is to multiplex output to zero or more
output handles. The IO::Tee constructor, given a list of output
handles, returns a tied handle that can be written to. When written
to (using print or printf), the IO::Tee object multiplexes the
output to the list of handles originally passed to the constructor.
As a shortcut, you can also directly pass a string or an array
reference to the constructor, in which case IO::File::new is called
for you with the specified argument or arguments.
.
The second way is to multiplex input from one input handle to zero or
more output handles as it is being read. The IO::Tee constructor,
given an input handle followed by a list of output handles, returns a
tied handle that can be read from as well as written to. When written
to, the IO::Tee object multiplexes the output to all handles passed
to the constructor, as described in the previous paragraph. When read
from, the IO::Tee object reads from the input handle given as the
first argument to the IO::Tee constructor, then writes any data
read to the output handles given as the remaining arguments to the
constructor.