Regarding 'for' loop in KornShell

Question

Is there a way to implement the following using \'for\' in KornShell (ksh)? Here is the C equivalent:

for(i=1;i<20;i++)
{
    printf(\"%d\",i);
}
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Answer 1

ksh93 supports the C-like (( ...;...; ...)):

for ((i=1;i<20;i+=1)); do
    printf "%d " $i
done && print

This will produce:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Heck, even the old syntax (using '{' ... '}' instead of 'do ... done' will work):

for((i=1;i<20;i+=1))
{
   printf "%d " $i
} && print

In older shells, you can still get the same effect with

i=1 && while ((i<20)); do
    printf "%d " $i
    ((i+=1))
done && print