The getopt function in the System Interfaces volume of POSIX.1-2017 assists utilities in handling options and operands that conform to these guidelines. Operands and option-arguments can contain characters not specified in the portable character set.

The Portable Operating System Interface (POSIX; IPA: / ˈpɒz.ɪks / [1]) is a family of standards specified by the IEEE Computer Society for maintaining compatibility between operating systems. [1] .

I'm writing a console application which allows several Posix flags to be set. This is what I'm using currently. Words in the flags are concatenated with a dash: -p, --broker-port int Broker...

The argument flags must include one of the following access modes: O_RDONLY, O_WRONLY, or O_RDWR. These request opening the file read-only, write-only, or read/write, respectively. In addition, zero or more file creation flags and file status flags can be bitwise ORed in flags.

posixoptions - optional parts of the POSIX standard DESCRIPTION top The POSIX standard (the information below is from POSIX.1-2001) describes a set of behaviors and interfaces for a compliant system.

May 26, 2016 · a flag doesn't have to be false by default. providing the flag on the command line just reverses its default state (on-->off, or off-->on). some people call that a toggle to distinguish it from a flag. others think the distinction is unimportant. –

Jan 15, 2021 · To set both append and nonblock, OR their constants together: fcntl(fd, F_SETFL, O_APPEND | O_NONBLOCK); With similar bit operations, you can operate on the flags returned by fl = fcntl(fd, F_GETFL): There's some more examples here.

POSIX recommends these conventions for command line arguments. getopt (see Parsing program options using getopt) and argp_parse (see Parsing Program Options with Argp) make it easy to implement them. Arguments are options if they begin with a hyphen delimiter (‘ - ’).

Apr 9, 1996 · The POSIX_FLAGS signature defines a generic set of operations on an abstract representation of system flags. It is included in various flag substructures of the other POSIX interfaces. Synopsis

Jul 25, 2023 · A similar flag is the "v," or verbose flag. It is also useful in debugging scripts. The difference is this: The "v" flag echoes the line as it is read, while the "x" flag causes each command to be echoed as it is executed.