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Tush Build Status

Tush is a modern, statically typed shell and scripting language. It is a major departure from classic Unix shells that were centred around string manipulation and substitution.

  • Structured. Work with lists, tuples, functions and files, not just raw strings.
  • Functional in syntax and type system, but imperative for working with the file system.
  • Concise but not cryptic. No more @du -hs "$v" >$@ or [[ -e "$f" ]]



  • An expressive type system. Parametric polymorphism, algebraic types and typeclasses. Immutable data.
  • Programs are functions. Command line arguments and pipes are unified as parameters.
  • Files, globs and regexes are first-class features with syntax for literals and path construction operators.
  • Lists, tuples, records and dictionaries, with handling operations inspired by relational algebra.
  • A new set of coreutils taking advantage of these facilities.
  • A full scripting language with sane control flow, pattern matching and macros.

See the quick start guide.

The language design has lots of open questions. Among them, how to:

  • Handle errors — exceptions, Maybe monad, error codes, other possibilites?
  • Dynamically type files — existential types?
  • Create a language that can be seamlessly used interactively, but also for safe scripting, for programming in the large.
  • Disambiguate the multiply operator (*) from a wildcard.


Dependencies: Boehm garbage collector, GNU Readline, libkiss

sudo apt-get install libreadline-dev libgc-dev

git clone
cd libkiss; make; cd -

git clone
cd tush
make && sudo make install


See and the todo list.


Copyright (c) 2015 Sam Nipps.

Unless otherwise stated, a source file in this package is under the GNU GPL V3 license.

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see