set(n) Tcl set(n)
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NAME
set - Read and write variables
SYNOPSIS
set varName ?value?
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DESCRIPTION
Returns the value of variable varName. If value is
specified, then set the value of varName to value, creating
a new variable if one doesn't already exist, and return its
value. If varName contains an open parenthesis and ends
with a close parenthesis, then it refers to an array
element: the characters before the first open parenthesis
are the name of the array, and the characters between the
parentheses are the index within the array. Otherwise
varName refers to a scalar variable. Normally, varName is
unqualified (does not include the names of any containing
namespaces), and the variable of that name in the current
namespace is read or written. If varName includes namespace
qualifiers (in the array name if it refers to an array
element), the variable in the specified namespace is read or
written.
If no procedure is active, then varName refers to a
namespace variable (global variable if the current namespace
is the global namespace). If a procedure is active, then
varName refers to a parameter or local variable of the
procedure unless the global command was invoked to declare
varName to be global, or unless a variable command was
invoked to declare varName to be a namespace variable.
KEYWORDS
read, write, variable
Page 1 (printed 2/19/99)
