mojave man page for set

set(n)							       Tcl Built-In Commands							    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 does
       not 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.

       If varName includes namespace qualifiers (in the array name if it refers to an array element), or  if  varName  is  unqualified	(does  not
       include	the  names  of any containing namespaces) but no procedure is active, varName refers to a namespace variable resolved according to
       the rules described under NAME RESOLUTION in the namespace manual page.

       If a procedure is active and varName is unqualified, then varName refers to a parameter or local variable of the procedure, unless  varName
       was declared to resolve differently through one of the global, variable or upvar commands.

EXAMPLES
       Store a random number in the variable r:
	      set r [expr {rand()}]

       Store a short message in an array element:
	      set anAry(msg) "Hello, World!"

       Store a short message in an array element specified by a variable:
	      set elemName "msg"
	      set anAry($elemName) "Hello, World!"

       Copy  a value into the variable out from a variable whose name is stored in the vbl (note that it is often easier to use arrays in practice
       instead of doing double-dereferencing):
	      set in0 "small random"
	      set in1 "large random"
	      set vbl in[expr {rand() >= 0.5}]
	      set out [set $vbl]

SEE ALSO
       expr(n), global(n), namespace(n), proc(n), trace(n), unset(n), upvar(n), variable(n)

KEYWORDS
       read, write, variable

Tcl																	    set(n)