range() and xrange() take a third parameter that specifies a step. So you can do the following.

range(10, 0, -1)

Which gives

[10, 9, 8, 7, 6, 5, 4, 3, 2, 1] 

But for iteration, you should really be using xrange instead. So,

xrange(10, 0, -1)

Note for Python 3 users: There are no separate range and xrange functions in Python 3, there is just range, which follows the design of Python 2's xrange.

You can use it like this

for (var i = 10; i >= 0; i--) 

But I'm not sure why are you doing so because you are not using this variable inside your loop so I think it doesn't make any difference to the output as you loop going to run 10 times either way.

If I could guess then I think you want to print the stars in reverse order of quantity. That means you want to have maximum stars in first row then -1 in second and so on.. If so then you need to reverse the order of inner loop only like this

 function seethestars1() {
    var stars = document.getElementById("emptytext2");
    for (var i = 0; i <= 10; i++) {
        for (var j = 10; j > i; j--) {
            stars.value += "*";
        }                            
      stars.value += "\n";
    }
}

Js Fiddle Demo

In bash or ksh, put the file names in an array, and iterate over that array in reverse order.

files=(/var/logs/foo*.log)
for ((i=${#files[@]}-1; i>=0; i--)); do
  bar "${files[$i]}"
done

The code above also works in zsh if the ksh_arrays option is set (it is in ksh emulation mode). There's a simpler method in zsh, which is to reverse the order of the matches through a glob qualifier:

for f in /var/logs/foo*.log(On); do bar $f; done

POSIX doesn't include arrays, so if you want to be portable, your only option to directly store an array of strings is the positional parameters.

set -- /var/logs/foo*.log
i=$#
while [ $i -gt 0 ]; do
  eval "f=\${$i}"
  bar "((i-1))
done

var num = 10,
reverse = false;

if(!reverse) for( var i=0;i<num;i++) log(i);
else         while(num-- )      log(num);

   // to avoid duplication if the code gets long
function log( num ) { console.log( num ); }

EDIT:

As noted in the comments below, if i is not declared elsewhere and you do not intend for it to be global, then declare it with the other variables you declared.

And if you don't want to modify the value of num, then assign it to i first.

var num = 10,
reverse = false,
i;

if(!reverse) for(var i=0;i<num;i++) log(i);   // Count up
else         {var i=num; while(i--) log(i);}  // Count down

function log( num ) { console.log( num ); }

How about:

for (unsigned i = n ; i-- > 0 ; )
{
  // do stuff with i
}