nobuf — run a program without stdio block buffering
nobuf {subprogram} {args...}
nobuf subprogram is similar to subprogram with one exception.
If subprogram uses stdio, it will use block buffering rather than line buffering when its output is redirected; nobuf subprogram will always use line buffering.
Internally, nobuf obtains a new pty and runs subprogram under it, transparently forwarding input and output.
nobuf initializes the pty to remote mode, where tty processing is disabled, input is flow-controlled, and end-of-file is passed through to subprogram.
nobuf is a synonym for ptyget ptyio -r ptyspawn -23x . ptyspawn(1) options may be used with nobuf.