03-07-2013
Perhaps now you understand my reluctance to use Windows CMD loops. echo rename works when rename doesn't because of inane inconsistencies in Windows' CMD parser.
Also, the variable set in the batch file is persistent, so if you mess it up one execution, you might still think it's working the next even when it isn't (because you messed up the syntax of set and it silently failed)
Oh, and sometimes it does the trick of setting the variable outside the loop but not inside it. Which makes interesting side-effects given the above.
The main problem is the difference between the special %a/%%a variable for generates, and the more normal environment variables required to do string operations. They don't cooperate, not being set properly inside the loop somehow. And all the special operations for for's special variables have been replaced with ones related to expanding file paths.
Last edited by Corona688; 03-07-2013 at 06:06 PM..
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while(n) Tcl Built-In Commands while(n)
__________________________________________________________________________________________________________________________________________________
NAME
while - Execute script repeatedly as long as a condition is met
SYNOPSIS
while test body
_________________________________________________________________
DESCRIPTION
The while command evaluates test as an expression (in the same way that expr evaluates its argument). The value of the expression must a
proper boolean value; if it is a true value then body is executed by passing it to the Tcl interpreter. Once body has been executed then
test is evaluated again, and the process repeats until eventually test evaluates to a false boolean value. Continue commands may be exe-
cuted inside body to terminate the current iteration of the loop, and break commands may be executed inside body to cause immediate termi-
nation of the while command. The while command always returns an empty string.
Note: test should almost always be enclosed in braces. If not, variable substitutions will be made before the while 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 $x<10:
set x 0
while {$x<10} {
puts "x is $x"
incr x
}
SEE ALSO
break(n), continue(n), for(n), foreach(n)
KEYWORDS
boolean value, loop, test, while
Tcl while(n)