tirnanog 1710962707 learn https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_403
emanuele6 1729941725 forget
emanuele6 1729941736 learn https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/V1_chap03.html#tag_03_387