misc command

This program works exactly like the `tee` program, if it was invoked with an implicit --ignore-interrupts argument, and if it also had an --ignore-quit argument. These are needed so that it doesn't exit prematurely when called as a receiving member of a shell pipeline. This is needed so that a ^C or ^\ can cause the sending process to shutdown and relay its data into the tee. Sadly, the venerable `tee` program can't currently ignore the QUIT signal.