pipe - open a pair of connected filehandles
pipe
READHANDLE,WRITEHANDLE
Opens a pair of connected pipes like the corresponding system call. Note
that if you set up a loop of piped processes, deadlock can occur unless you
are very careful. In addition, note that Perl's pipes use stdio buffering,
so you may need to set $| to flush your
WRITEHANDLE after each command, depending on the
application.
See Open2, Open3, and Bidirectional Communication
for examples of such things.