1set(n) Tcl Built-In Commands set(n)
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8 set - Read and write variables
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11 set varName ?value?
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15 Returns the value of variable varName. If value is specified, then set
16 the value of varName to value, creating a new variable if one does not
17 already exist, and return its value. If varName contains an open
18 parenthesis and ends with a close parenthesis, then it refers to an
19 array element: the characters before the first open parenthesis are
20 the name of the array, and the characters between the parentheses are
21 the index within the array. Otherwise varName refers to a scalar vari‐
22 able.
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24 If varName includes namespace qualifiers (in the array name if it
25 refers to an array element), or if varName is unqualified (does not
26 include the names of any containing namespaces) but no procedure is
27 active, varName refers to a namespace variable resolved according to
28 the rules described under NAME RESOLUTION in the namespace manual page.
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30 If a procedure is active and varName is unqualified, then varName
31 refers to a parameter or local variable of the procedure, unless var‐
32 Name was declared to resolve differently through one of the global,
33 variable or upvar commands.
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36 Store a random number in the variable r:
37 set r [expr {rand()}]
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39 Store a short message in an array element:
40 set anAry(msg) "Hello, World!"
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42 Store a short message in an array element specified by a variable:
43 set elemName "msg"
44 set anAry($elemName) "Hello, World!"
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46 Copy a value into the variable out from a variable whose name is stored
47 in the vbl (note that it is often easier to use arrays in practice
48 instead of doing double-dereferencing):
49 set in0 "small random"
50 set in1 "large random"
51 set vbl in[expr {rand() >= 0.5}]
52 set out [set $vbl]
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55 expr(n), global(n), namespace(n), proc(n), trace(n), unset(n),
56 upvar(n), variable(n)
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59 read, write, variable
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63Tcl set(n)