Tornado

Tornado 2.0
User’s Guide
For the first two problems (control structures, or display and manipulation of
types that are not supported in the shell), you might also consider writing auxiliary
subroutines to provide these services during development; you can call such
subroutines at will from the shell, and later omit them from your final application.
5.3.12 C-Interpreter Primitives
Table 5-13 lists all the primitives (commands) built into WindSh. Because the shell
tries to find a primitive first before attempting to call a target subroutine, it is best
to avoid these names in the target code. If you do have a name conflict, however,
you can force the shell to call a target routine instead of an identically-named
primitive by prefacing the subroutine call with the character @. See Resolving Name
Conflicts between Host and Target, p.168.
5.3.13 Terminal Control Characters
When you start a shell from the launcher, the launcher creates a new xterm
window for the shell. The terminal control characters available in that window
match whatever you are used to in your UNIX shells. You can specify all but one
of these control characters (as shown in Table 5-14); see your host documentation
for the UNIX command stty.
When you start the shell from the UNIX command line, it inherits standard input
and output (and the associated stty settings) from the parent UNIX shell.
Table 5-14 lists special terminal characters frequently used for shell control. For
more information on the use of these characters, see 5.5 Shell Line Editing, p.193
and 5.2.7 Interrupting a Shell Command, p.173.
5.3.14 Redirection in the C Interpreter
The shell provides a redirection mechanism for momentarily reassigning the
standard input and standard output file descriptors just for the duration of the
parse and evaluation of an input line. The redirection is indicated by the < and >
symbols followed by file names, at the very end of an input line. No other syntactic
elements may follow the redirection specifications. The redirections are in effect for
all subroutine calls on the line.
For example, the following input line sets standard input to the file named input
and standard output to the file named output during the execution of copy( ):
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