Xs - The eXtensible Shell
=========================

Xs is a cleanly-designed shell with functional programming. It is
based on the source code for the es project, which was in the public
domain and derived from rc, which was also in the public domain. The
changes in xs can also be considered to be in the public domain.

Xs is not source-level compatible with es or rc.

Ancestral Implementations
-------------------------

The es shell source code is currently located at:
ftp://ftp.sys.utoronto.ca/pub/es/ .

Other es information is at:
https://wryun.github.io/es-shell/
https://wryun.github.io/es-shell/paper.html
https://wryun.github.io/es-shell/manpage.html

Information regarding rc is at:
http://tobold.org/article/rc
http://static.tobold.org/rc/rc-duff.html
