CommandWindow V1.0 - initial release.
Requires OSProcess V2.1.

Herewith a Smalltalk simulation of a Unix command shell, with a simple dumb
terminal window. Requires OSProcess. Works only on Unix systems.

Class CommandShell is a command shell, similar to /bin/sh, with a command
line user interface. It collaborates with process proxies to provide command
execution, and provides a limited set of built in commands similar to those in
a Unix shell. Built in commands are implemented in Smalltalk, and any other
commands are passed to process proxies to be executed externally.

ShellWindowMorph is a simple teletype shell session morph, providing a view on
an instance of CommandShell.

UnixCommand adds command line parsing and file name globbing to a
ConnectedUnixProcess. This allows direct execution of external commands without
use of an external command shell.

PipeableEvaluator evaluates Smalltalk expressions and provides a framework
for pipelines of expressions combining Smalltalk expressions with external
Unix commands.

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