In addition to the web links, you can also install the POSIX man pages, e.g. on a Debian-like system they are available as manpages-posix-dev package. Then you can lookup the POSIX version of say - the read system call - via: $ man 3p read Or the mv command $ man 1p mv Just add a p to the usual man page section number.

POSIX first was a standard in 1988 long before the Single UNIX Specification. It was one of the attempts at unifying all the various UNIX forks and UNIX-like systems. POSIX is an IEEE Standard, but as the IEEE does not own the UNIX® trademark, the standard is not UNIX® though it is based on the existing UNIX API at that time.

2014年11月20日 · @Sandburg POSIX is a standard, so it can't have built-ins. It doesn't define if something should be built into the interpreter or not, just what it has to do. These rules apply to both forms, test and [alike. If a shell can do the evaluation on its own, that saves you a process and makes it somewhat faster, but the result has to be the same.

Today, POSIX and SUS are basically the same thing; SUS encompasses a little more. Quoting here: Beginning in 1998, a joint working group known as the Austin Group began to develop the combined standard that would be known as the Single UNIX Specification Version 3 and as POSIX:2001 (formally: IEEE Std 1003.1-2001). It was released on January 30 ...

2013年1月2日 · A POSIX version needs several elements changed to work: i=16 while echo "this command is executed at least ...

2014年12月12日 · bash can run in POSIX compliant mode "bash --posix" at your bash command prompt will enter this mode. to exit, simply type "bash" again, in your terminal. Bash is intended to be a conformant implementation of the Shell and Utilities portion of the IEEE POSIX specification (IEEE Standard 1003.1).

2017年1月28日 · An added (in comments) requirement is to generate a POSIX compliant solution. POSIX. Extending the idea to make it run only with POSIX options. That means mainly no -d for read. That forces a read for each line. That, in turn forces the need to capture a line at a time. Then, to build the var a trailing new line must be added (as the read ...

Later, Unix inspired POSIX. Read the history of Unix . Linux is a free software kernel under GPLv2 license started by Linus Torvarlds (mixed with GNU applications, hence called GNU/Linux; Linus originally used Minix , a Unix-like system by Tanenbaum et al, but was unhappy and coded the first Linux kernel ).

The third parameter of posix_spwan is a pointer of type posix_spawn_file_actions_t (one you have given as NULL). posix_spawn will open, close or duplicate file descriptors inherited from the calling process as specified by the posix_spawn_file_actions_t object.

2017年5月12日 · They interfere with each other when modifying owner's, owning group and other permissions: when setting current value for these from setfacl, it will actually set the posix permission, not the ACL one. Posix permissions only allows an owner, owning group and "everyone" permission while ACL allows multiple "owning" users and group.