12-07-2011
.hushlogin
I executed the command you said and the result is same.
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LEARN ABOUT OPENDARWIN
uplevel
uplevel(n) Tcl Built-In Commands uplevel(n)
__________________________________________________________________________________________________________________________________________________
NAME
uplevel - Execute a script in a different stack frame
SYNOPSIS
uplevel ?level? arg ?arg ...?
_________________________________________________________________
DESCRIPTION
All of the arg arguments are concatenated as if they had been passed to concat; the result is then evaluated in the variable context indi-
cated by level. Uplevel returns the result of that evaluation.
If level is an integer then it gives a distance (up the procedure calling stack) to move before executing the command. If level consists
of # followed by a number then the number gives an absolute level number. If level is omitted then it defaults to 1. Level cannot be
defaulted if the first command argument starts with a digit or #.
For example, suppose that procedure a was invoked from top-level, and that it called b, and that b called c. Suppose that c invokes the
uplevel command. If level is 1 or #2 or omitted, then the command will be executed in the variable context of b. If level is 2 or #1
then the command will be executed in the variable context of a. If level is 3 or #0 then the command will be executed at top-level (only
global variables will be visible).
The uplevel command causes the invoking procedure to disappear from the procedure calling stack while the command is being executed. In
the above example, suppose c invokes the command
uplevel 1 {set x 43; d}
where d is another Tcl procedure. The set command will modify the variable x in b's context, and d will execute at level 3, as if called
from b. If it in turn executes the command
uplevel {set x 42}
then the set command will modify the same variable x in b's context: the procedure c does not appear to be on the call stack when d is
executing. The command ``info level'' may be used to obtain the level of the current procedure.
Uplevel makes it possible to implement new control constructs as Tcl procedures (for example, uplevel could be used to implement the while
construct as a Tcl procedure).
namespace eval is another way (besides procedure calls) that the Tcl naming context can change. It adds a call frame to the stack to rep-
resent the namespace context. This means each namespace eval command counts as another call level for uplevel and upvar commands. For
example, info level 1 will return a list describing a command that is either the outermost procedure call or the outermost namespace eval
command. Also, uplevel #0 evaluates a script at top-level in the outermost namespace (the global namespace).
SEE ALSO
namespace(n), upvar(n)
KEYWORDS
context, level, namespace, stack frame, variables
Tcl uplevel(n)