Tk Built-In Commands console(1T)
NAME
console - Control the console on systems without a real con-
sole
SYNOPSIS
console subcommand ?arg ...?
DESCRIPTION
The console window is a replacement for a real console to
allow input and output on the standard I/O channels on plat-
forms that do not have a real console. It is implemented as
a separate interpreter with the Tk toolkit loaded, and con-
trol over this interpreter is given through the console com-
mand. The behaviour of the console window is defined mainly
through the contents of the console.tcl file in the Tk
library (or the Console resource on Macintosh systems.)
console eval script
Evaluate the script argument as a Tcl script in the
console interpreter. The normal interpreter is
accessed through the consoleinterp command in the con-
sole interpreter.
console hide
Hide the console window from view. Precisely
equivalent to withdrawing the . window in the console
interpreter.
console show
Display the console window. Precisely equivalent to
deiconifying the
console title ?string?
Query or modify the title of the console window. If
string is not specified, queries the title of the con-
sole window, and sets the title of the console window
to string otherwise. Precisely equivalent to using the
wm title command in the console interpreter.
ACES TO THE MAIN INTERPRETER
The consoleinterp command in the console interpreter allows
scripts to be evaluated in the main interpreter. It sup-
ports two subcommands: eval and record.
consoleinterp eval script
Evaluates script as a Tcl script at the global level in
the main interpreter.
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Tk Built-In Commands console(1T)
consoleinterp record script
Records and evaluates script as a Tcl script at the
global level in the main interpreter as if script had
been typed in at the console.
ADITIONAL TRAP CALS
There are several additional commands in the console inter-
preter that are called in response to activity in the main
interpreter. These are documented here for completeness
only; they form part of the internal implementation of the
console and are likely to change or be modified without
warning.
Output to the console from the main interpreter via the
stdout and stderr channels is handled by invoking the
tk::ConsoleOutput command in the console interpreter with
two arguments. The first argument is the name of the chan-
nel being written to, and the second argument is the string
being written to the channel (after encoding and end-of-line
translation processing has been performed.)
When the . window of the main interpreter is destroyed, the
tk::ConsoleExit command in the console interpreter is called
(assuming the console interpreter has not already been
deleted itself, that is.)
DEFAULT BINDINGS
The default script creates a console window (implemented
using a text widget) that has the following behaviour:
[1] Pressing the tab key inserts a TAB character (as
defined by the Tcl \t escape.)
[2] Pressing the return key causes the current line (if
complete by the rules of info complete) to be passed to
the main interpreter for evaluation.
[3] Pressing the delete key deletes the selected text (if
any text is selected) or the character to the right of
the cursor (if not at the end of the line.)
[4] Pressing the backspace key deletes the selected text
(if any text is selected) or the character to the left
of the cursor (of not at the start of the line.)
[5] Pressing either Control]A or the home key causes the
cursor to go to the start of the line (but after the
prompt, if a prompt is present on the line.)
[6] Pressing either Control]E or the end key causes the
cursor to go to the end of the line.
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Tk Built-In Commands console(1T)
[7] Pressing either Control]P or the up key causes the pre-
vious entry in the command history to be selected.
[8] Pressing either Control]N or the down key causes the
next entry in the command history to be selected.
[9] Pressing either Control]B or the left key causes the
cursor to move one character backward as long as the
cursor is not at the prompt.
[10] Pressing either Control]F or the right key causes the
cursor to move one character forward.
[11] Pressing F9 rebuilds the console window by destroying
all its children and reloading the Tcl script that
defined the console's behaviour.
Most other behaviour is the same as a conventional text
widget except for the way that the <> event is handled
identically to the <> event.
EXAMPLE
Not all platforms have the console command, so debugging
code often has the following code fragment in it so output
produced by puts can be seen while during development:
catch {console show}
KEYWORDS
console, interpreter, window, interactive, output channels
SEE ALSO
destroy(1T), fconfigure(1T), history(1T), interp(1T),
puts(1T), text(1T), wm(1T)
ATRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
ATRIBUTE TYPE ATRIBUTE VALUE
Availability SUNWTk
Interface Stability Uncommitted
NOTES
Source for Tk is available on http:/opensolaris.org.
Tk Last change: 8.4 3
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