Xonsh (The Xonsh Shell) vs Common Lisp

Xonsh uses a syntax which is a superset of Python 3.4 plus some additional shell primitives. Because of the similarity to Python, which is famously an easy to understand programming language, the syntax of Xonsh is pretty easy to grasp too, even more so for Python programmers.

Most parts of xonsh are extensible. You can change tab-completer, prompt, history backend, aliases, functions and pack it to special package (called "xontrib") and put it on Github. The logic are clear and documented well.

The xonsh shell has AppImage that makes it Linux-portable.

Xonsh has one feature that can be considered particularly unique. It stores not just the commands you type, but their output, and doing a search on your history (configurably) can search the output as well.

Xonsh has native cross-platform support.

Almost all aspects of the language are designed with interactive/repl use in mind.

SLIME (Superior Lisp Interaction Mode for Emacs).

It is easy to recover from errors. Error resolution can be determined by the user at the REPL.

The state of the program may be saved and reloaded as an image, supporting safer modification of the running program. New code may be compiled into the image as the program runs, while late binding ensures that symbol redefinitions take effect throughout the program.

Some compilers such as SBCL can be faster than C or other low-level languages, and most compilers can generate fast native code.