set(n) - phpMan

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 var-
       Name 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  ele-
       ment),  or  if varName is unqualified (does not include the names of any containing names-
       paces) but no procedure is active, varName refers to a namespace variable resolved accord-
       ing 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)

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