variable man page on SmartOS

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variable(n)		     Tcl Built-In Commands		   variable(n)


       variable - create and initialize a namespace variable

       variable name

       variable ?name value...?

       This command is normally used within a namespace eval command to create
       one or more variables within a namespace.  Each variable name  is  ini‐
       tialized with value.  The value for the last variable is optional.

       If  a  variable	name  does not exist, it is created.  In this case, if
       value is specified, it is assigned to the newly created	variable.   If
       no  value  is  specified,  the  new variable is left undefined.	If the
       variable already exists, it is set to value if value  is	 specified  or
       left  unchanged	if  no	value is given.	 Normally, name is unqualified
       (does not include the names of  any  containing	namespaces),  and  the
       variable	 is  created  in  the current namespace.  If name includes any
       namespace qualifiers, the variable is created in the  specified	names‐
       pace.  If the variable is not defined, it will be visible to the names‐
       pace which command, but not to the info exists command.

       If the variable command is executed inside a Tcl procedure, it  creates
       local  variables	 linked	 to the corresponding namespace variables (and
       therefore these variables are listed by info vars.)  In	this  way  the
       variable command resembles the global command, although the global com‐
       mand only links to variables in the global namespace.   If  any	values
       are  given, they are used to modify the values of the associated names‐
       pace variables.	If a namespace variable does not exist, it is  created
       and optionally initialized.

       A  name argument cannot reference an element within an array.  Instead,
       name should reference the entire array, and  the	 initialization	 value
       should  be  left	 off.	After the variable has been declared, elements
       within the array can be set using ordinary set or array commands.

       Create a variable in a namespace:

	      namespace eval foo {
		  variable bar 12345

       Create an array in a namespace:

	      namespace eval someNS {
		  variable someAry
		  array set someAry {
		      someName	someValue
		      otherName otherValue

       Access variables in namespaces from a procedure:

	      namespace eval foo {
		  proc spong {} {
		      # Variable in this namespace
		      variable bar
		      puts "bar is $bar"

		      # Variable in another namespace
		      variable ::someNS::someAry
		      parray someAry

       global(n), namespace(n), upvar(n)

       global, namespace, procedure, variable

Tcl				      8.0			   variable(n)

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