ano 1721426193 learn https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap12.html (posix) https://www.gnu.org/prep/standards/html_node/Command_002dLine-Interfaces.html (gnu)
ano 1721427221 forget
ano 1721427228 learn (POSIX Utility Conventions) https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap12.html (GNU Coding Standards for Command Line Interfaces) https://www.gnu.org/prep/standards/html_node/Command_002dLine-Interfaces.html
ano 1721429613 forget
ano 1721429678 learn (POSIX Utility Conventions) https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/V1_chap12.html (GNU Coding Standards for Command Line Interfaces) https://www.gnu.org/prep/standards/html_node/Command_002dLine-Interfaces.html