>>819
どこにも同じ動きとは書いていない

https://pubs.opengroup.org/onlinepubs/9699919799/utilities/cut.html

-b list
Cut based on a list of bytes. Each selected byte shall be output unless the -n option is also specified.
It shall not be an error to select bytes not present in the input line.

-c list
Cut based on a list of characters. Each selected character shall be output.
It shall not be an error to select characters not present in the input line.