C++ Groff XS Shell Perl
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Xs is a cleanly-designed shell with functional programming. It is based off the source-code for the es project, which was 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. See the manpage (xs.1) for more details about it. Most of the xs source code remains the same as es. The primary authors of that shell can be found in that source code, currently located at: ftp://ftp.sys.utoronto.ca/pub/es/. Modifications since es-0.9-beta1 are all parts of xs and have been written by Frederic Koehler.