Hello,
I think, there is document bug related to 'for' compound command in both
Man page and Info doc.
In man page, description of 'for' compound command ...
****************************************************************************************************
* for (( expr1 ; expr2 ; expr3 )) ; do list ; done
* First, the arithmetic expression expr1 is evaluated according
* to the rules described below under ARITHMETIC EVALUATION.
* The arithmetic expression expr2 is then evaluated repeatedly
* until it evaluates to
zero. <-- not zero, but 1
* Each time expr2 evaluates to a non-zero
value, <-- not non-zero,but 0
* list is executed and the arithmetic expression expr3 is evaluated.
* If any expression is omitted, it behaves as if it evaluates to
1. <-- not 1, but 0
* The return value is the exit status of the last command in list
* that is executed, or false if any of the expressions is invalid.
****************************************************************************************************
And same document bug in Info documentation of bash.
This bug is seen at bash 4.4.
Thanks,
Vanou