1console(n) Tk Built-In Commands console(n)
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8 console - Control the console on systems without a real console
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11 console subcommand ?arg ...?
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16 The console window is a replacement for a real console to allow input
17 and output on the standard I/O channels on platforms that do not have a
18 real console. It is implemented as a separate interpreter with the Tk
19 toolkit loaded, and control over this interpreter is given through the
20 console command. The behaviour of the console window is defined mainly
21 through the contents of the console.tcl file in the Tk library (or the
22 Console resource on Macintosh systems.)
23 console eval script
25 Evaluate the script argument as a Tcl script in the console
26 interpreter. The normal interpreter is accessed through the
27 consoleinterp command in the console interpreter.
28 console hide
30 Hide the console window from view. Precisely equivalent to
31 withdrawing the . window in the console interpreter.
32 console show
34 Display the console window. Precisely equivalent to deiconify‐
35 ing the . window in the console interpreter.
36 console title ?string?
38 Query or modify the title of the console window. If string is
39 not specified, queries the title of the console window, and sets
40 the title of the console window to string otherwise. Precisely
41 equivalent to using the wm title command in the console inter‐
42 preter.
43
45 The consoleinterp command in the console interpreter allows scripts to
46 be evaluated in the main interpreter. It supports two subcommands:
47 eval and record.
48 consoleinterp eval script
50 Evaluates script as a Tcl script at the global level in the main
51 interpreter.
52 consoleinterp record script
54 Records and evaluates script as a Tcl script at the global level
55 in the main interpreter as if script had been typed in at the
56 console.
57
59 There are several additional commands in the console interpreter that
60 are called in response to activity in the main interpreter. These are
61 documented here for completeness only; they form part of the internal
62 implementation of the console and are likely to change or be modified
63 without warning.
64 Output to the console from the main interpreter via the stdout and
66 stderr channels is handled by invoking the tk::ConsoleOutput command in
67 the console interpreter with two arguments. The first argument is the
68 name of the channel being written to, and the second argument is the
69 string being written to the channel (after encoding and end-of-line
70 translation processing has been performed.)
71 When the . window of the main interpreter is destroyed, the tk::Con‐
73 soleExit command in the console interpreter is called (assuming the
74 console interpreter has not already been deleted itself, that is.)
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77 The default script creates a console window (implemented using a text
78 widget) that has the following behaviour:
79 [1] Pressing the tab key inserts a TAB character (as defined by the
81 Tcl \t escape.)
82 [2] Pressing the return key causes the current line (if complete by
84 the rules of info complete) to be passed to the main interpreter
85 for evaluation.
86 [3] Pressing the delete key deletes the selected text (if any text
88 is selected) or the character to the right of the cursor (if not
89 at the end of the line.)
90 [4] Pressing the backspace key deletes the selected text (if any
92 text is selected) or the character to the left of the cursor (of
93 not at the start of the line.)
94 [5] Pressing either Control+A or the home key causes the cursor to
96 go to the start of the line (but after the prompt, if a prompt
97 is present on the line.)
98 [6] Pressing either Control+E or the end key causes the cursor to go
100 to the end of the line.
101 [7] Pressing either Control+P or the up key causes the previous
103 entry in the command history to be selected.
104 [8] Pressing either Control+N or the down key causes the next entry
106 in the command history to be selected.
107 [9] Pressing either Control+B or the left key causes the cursor to
109 move one character backward as long as the cursor is not at the
110 prompt.
111 [10] Pressing either Control+F or the right key causes the cursor to
113 move one character forward.
114 [11] Pressing F9 rebuilds the console window by destroying all its
116 children and reloading the Tcl script that defined the console's
117 behaviour.
118 Most other behaviour is the same as a conventional text widget except
120 for the way that the <<Cut>> event is handled identically to the
121 <<Copy>> event.
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124 Not all platforms have the console command, so debugging code often has
125 the following code fragment in it so output produced by puts can be
126 seen while during development:
127 catch {console show}
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131 console, interpreter, window, interactive, output channels
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135 destroy(n), fconfigure(n), history(n), interp(n), puts(n), text(n),
136 wm(n)
137Tk 8.4 console(n)