=over =item pipe READHANDLE,WRITEHANDLE X 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 IO buffering, so you may need to set C to flush your WRITEHANDLE after each command, depending on the application. See L<:open2>, L<:open3>, and L for examples of such things. On systems that support a close-on-exec flag on files, that flag is set on all newly opened file descriptors whose Cs are I than the current value of $^F (by default 2 for C). See L. =back