loop through variable

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for

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

__________________________________________________________________________________________________________________________________________________

NAME

       for - ``For'' loop

SYNOPSIS

       for start test next body
_________________________________________________________________

DESCRIPTION

       For  is	a  looping command, similar in structure to the C for statement.  The start, next, and body arguments must be Tcl command strings,
       and test is an expression string.  The for command first invokes the Tcl interpreter to execute start.  Then it repeatedly  evaluates  test
       as  an expression; if the result is non-zero it invokes the Tcl interpreter on body, then invokes the Tcl interpreter on next, then repeats
       the loop.  The command terminates when test evaluates to 0.  If a continue command is invoked within body then any  remaining  commands	in
       the  current  execution of body are skipped; processing continues by invoking the Tcl interpreter on next, then evaluating test, and so on.
       If a break command is invoked within body or next, then the for command will return immediately.  The operation of break and  continue  are
       similar to the corresponding statements in C.  For returns an empty string.

       Note:  test  should almost always be enclosed in braces.  If not, variable substitutions will be made before the for command starts execut-
       ing, which means that variable changes made by the loop body will not be considered in the expression.  This is	likely	to  result  in	an
       infinite loop.  If test is enclosed in braces, variable substitutions are delayed until the expression is evaluated (before each loop iter-
       ation), so changes in the variables will be visible.  For an example, try the following script with and without the braces around $x<10:
	      for {set x 0} {$x<10} {incr x} {
		puts "x is $x"
	      }

SEE ALSO

       break, continue, foreach, while

KEYWORDS

       for, iteration, looping

Tcl																	    for(n)

Shell Programming and Scripting