: is a sort of 'null' function in bash and bourne shells. It also always returns 0 so it's an alternative to 'true'. https://pubs.opengroup.org/onlinepubs/9699

: is a sort of 'null' function in bash and bourne shells. It also always returns 0 so it's an alternative to 'true'. https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_16 https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V...