''I just want to clear the screen'' sounds like such a simple thing.  Why is it
difficult?  Because there are so many types of screens!  Are we talking about a
terminal emulator program, like xterm, rxvt, telnet?  Are we talking about a
physical terminal on a serial line (vt220)?  Is it a line printer???? Is it a
Tk text widget?

Here are a few ways:

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exec clear >@ stdout        ; # Most unix systems should have a clear command
puts [exec clear]           ; # The puts forces the connection to stdout?

puts \x1B\[2J               ; # for Solaris xterm - VERY terminal specific

eval exec [auto_execok cls] ; # Most windows systems should have a cls

exec command /c cls         ; # DOS?

exec >&@stdout $::env(COMSPEC) /c cls    ; # Win95

$t delete 1.0 end           ;# Tk text widget
======

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In
[http://groups.google.com/d/msg/comp.lang.tcl/Fm4uNklI8l4/rtKtxDkGUIwJ%|%clear
screen from within Tcl], [comp.lang.tcl], 2005-04-13, [Bruce Hartweg] suggests:

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eval exec >&@stdout <@stdin [auto_execok cls]
======

[Ro]: ''Pretty neat tricks ;)''

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Angel Sosa:

In addition the following examples clears the whole screen ''(on which
platforms and for what kinds of machines?)''

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puts \x1b\[H\x1b\[2J
======

This initializes and clears the screen on a unix system with some sort of terminfo/termcap/curses library installation:
:
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exec tput clear >@ stdout
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