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variables
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1990-05-03
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VARIABLES
Tcl allows the definition of variables and the use of their
values either through $-style variable substitution, the set
command, or a few other mechanisms. Variables need not be
declared: a new variable will automatically be created each
time a new variable name is used. Variables may be either
global or local. If a variable name is used when a
procedure isn't being executed, then it automatically refers
to a global variable. Variable names used within a
procedure normally refer to local variables associated with
that invocation of the procedure. Local variables are
deleted whenever a procedure exits. The global command may
be used to request that a name refer to a global variable
for the duration of the current procedure (this is somewhat
analogous to extern in C).