1. <operating system> One of Unix's buffers which can be written to by one asynchronous process and read by another, with the kernel suspending and waking up the sender and receiver according to how full the pipe is. In later versions of Unix, rather than using an anonymous kernel-managed temporary file to implement a pipe, it can be named and is implemented as a local socket pair.
grep foo log | morewhich feeds the output of grep into the input of more without requiring a named temporary file and without waiting for the first process to finish.
See also light pipe.