hush/README.md

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The hush shell for GNO
======================
This is a port of the hush shell to the GNO multitasking environment for the
Apple IIgs. Hush is a Bourne/POSIX-style shell that was originally part
of BusyBox. In general, it implements most of the features you would expect,
although there are a few missing ones (such as tilde expansion and aliases).
Supported features include:
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* if/then/elif/else/fi conditionals
* for/in/do/done loops
* while loops
* case/esac
* functions
* redirections (including specifying file descriptors)
* here documents
* arithmetic with `$((...))`
* command substitution with backticks or `$(...)`
* glob pattern expansion (including globbing across multiple directory levels)
* command line editing with history and tab completion
* job control
* and much more...
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The (useful) command line options are:
hush [-nxl] [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]
These all behave similarly to other Bourne/POSIX-style shells (e.g. Bash).
Run `help` within hush to get a list of built-in commands.
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Installation
------------
To use hush, you need GNO 2.0.6. Just copy the "hush" binary to a suitable
location. (You may want to install it as /bin/sh to support portable scripts
that expect a Bourne-type shell in that location).
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Building
--------
To build it, you also need ORCA/C 2.2.x and plenty of memory (8MB is enough).
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You also need to have a copy of the ltermcap library from GNO 2.0.4 installed
as `/usr/lib/libtermcap.204` (the GNO 2.0.6 version is broken and won't work).
Run `make` or (if the source files don't have correct filetypes) `make build`.
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You should also be able to build it on modern *nix systems by running `make`,
although this is meant mainly for testing purposes.
GNO-specific notes and known issues
-----------------------------------
* $PATH is expected to be in the usual GNO format (searched backwards, with
spaces as separators).
* File descriptors 0, 1, and 2 appearing in shell operations like redirections
are translated to 1, 2, and 3, respectively. This maintains compatibility
with Unix shell scripts that expect these to be stdin, stdout, and stderr.
* Glob expansion doesn't work with patterns containing : directory separators.
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Use / separators instead. Also, note that pattern matching is
case-sensitive even though the filesystem is not.
* Shell variable names are case-insensitive on GNO. This matches GNO's
handling of environment variables.
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* In TMTerm, command-line editing operations can produce messed-up formatting.
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Startup files
-------------
This version of hush will read commands from several files at startup, if they
are present:
* First, it runs commands from `/etc/hushenv`, then from `$HOME/hushenv`.
* Next, if it is a login shell, it runs commands from `/etc/profile`, then
from `$HOME/hushprofile` (if it is present) or `$HOME/profile`.
* Finally, if it is an interactive shell, it runs commands from
`$HOME/hushrc`.
(It also supports versions of the user startup files with names starting with
`.`, which will be used preferentially if present, but these names are not
compatible with ProDOS filesystems.)
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The `etc` directory contains sample `hushenv` and `profile` scripts, suitable
for installation in `/etc` or in your home directory.
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License
-------
Hush is licensed under the GNU General Public License version 2, contained in
the file LICENSE. Some individual source files contain code licensed under
other GPL-compatible permissive licenses. See the individual source files for
full licensing details and copyright notices.
The compiled hush binary also contains code from the ORCA/C runtime libraries,
to which the following notice applies:
This program contains material from the ORCA/C Run-Time Libraries,
copyright 1987-1996 by Byte Works, Inc. Used with permission.