Description:

empty is an utility that provides an interface to execute and/or interact
with processes under pseudo-terminal sessions (PTYs). This tool is definitely
useful in programming of shell scripts designed to communicate with interactive
programs like telnet, ssh, ftp, etc. In some cases empty can be the simplest
replacement for TCL/expect or other similar programming tools because empty:

* can be easily invoked directly from shell prompt or script
* does not use TCL, Perl, PHP, Python,... as an underlying language
* is written entirely in C
* has small and simple source code
* can easily be ported to almost all UNIX-like systems