This is the AT&T Software Technology ast software download site from AT&T Research. The AT&T AST OpenSource Software Collection provides an overview and Practical Reusable UNIX Software provides a historical perspective. You can join the ast and uwin mailgroups, or monitor the mail archives. There is also an AT&T internal talk. The man page inde…
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Latest commit 6aa47e0 Dec 17, 2017 @krader1961 krader1961 Remove SHOPT_COMPLETE symbol
Command completion support has existed long enough that it can no longer
be considered optional. So remove the #define symbol that implies it
is optional.

Partial fix for #210


This repository contains the AT&T Software Technology (AST) toolkit from AT&T Research. As of November 2017 the development focus has been shifted to the ksh93 command and libraries required to build it. See below for details on which branches contain the full AST code.


Building ksh93 requires the Meson build system.

To build it, execute These commands from the project root directory:

meson build
ninja -C build


All test cases can be run with:

meson test

If your system has an old version of Meson you may need to run mesontest (notice the missing space).

To run a specific unit test simply append it's name minus the .sh extension suffix. For example,

meson test builtins

Working with the full AST source

Full AST source code is available under the 2012-08-01-master and 2016-01-10-beta branches (see below for more details). Bug fixes to these branches are welcome but they are otherwise under low maintenance.

The full AST code includes many tools and libraries, like KSH, NMAKE, SFIO, VMALLOC, VCODEX, etc. It also includes more efficient replacements for a lot of the POSIX tools. It was designed to be portable across many UNIX systems and also works under UWIN on Microsoft Windows (see UWIN repo on GitHub under att/uwin).

This software is used to build itself, using NMAKE. After cloning this repo, cd to the top directory of it and run:

./bin/package make

Almost all the tools in this package (including the bin/package script are self-documenting; run --man (or --html) for the man page for the tool.

(If you were used to the old AST packaging mechanism, on, this repo is equivalent to downloading the INIT and ast-open packages and running: ./bin/package read on them).


The master branch contains the current development version of ksh93. It only contains source code for ksh93 and the libraries required to build it.

The 2012-08-01-master branch contains the the last stable release of full AST source code. It contains one cherry-picked change to allow building on Linux.

The 2016-01-10-beta branch contains the last beta release of full AST source code plus a number of patches that were later added on top of it.

The gh-pages branch will probably be removed. It contains files needed to generate the static AST project page hosted by Github. See for more info.