Posix.1-2024 is published

Post by mathfailure » Sat, Jun 15, 2024, 11:46 AM UTC

chubot wrote: post #36

susam wrote: post #8

I am hoping this appears at https://pubs.opengroup.org/onlinepubs/9699919799/ soon. This is the link I use most often to go through the specification. In fact, I owe a lot of my shell scripting skills to this online resource. As a specific example, the seemingly simple matter of when the shell decides to split a string based on $IFS and when it does not were quite confusing to me until I went through the specificatio…

I think many people are even more surprised by this: x=$a # not split! It means the same thing as x="$a" They were taught that you have to quote everything, which is a reasonable rule to follow, but it's not true. --- I never wrote about this on the Oils blog ( https://www.oilshell.org/ ), but the post would be titled: Shell Has Context Sensitive Evaluation Basically the two contexts you should think of are: (1) EVAL…

Post by nwellnhof » Sat, Jun 15, 2024, 3:24 PM UTC

clausecker wrote: post #5

a-french-anon wrote: post #3

Some goodies for POSIX sh programmers: * readlink/realpath ( https://austingroupbugs.net/view.php?id=1457 ) * find -print0, xargs -0 and read -d ( https://austingroupbugs.net/view.php?id=243 ) * find -iname ( https://austingroupbugs.net/view.php?id=1031 * sed -E ( https://austingroupbugs.net/view.php?id=528 ) * set -o pipefail ( https://austingroupbugs.net/view.php?id=789 )

Also c17 -G to create shared objects, SIGWINCH and tcgetwinsize() to query the size of a terminal window, lots of new shell features, make is now somewhat useful, gettext() and associated commands are in, asprintf(), C17 support, strlcpy, strlcat, and many more all new and exciting features.

Post by BoingBoomTschak » Sat, Jun 15, 2024, 6:16 PM UTC

mathfailure wrote: post #82

a-french-anon wrote: post #3

Some goodies for POSIX sh programmers: * readlink/realpath ( https://austingroupbugs.net/view.php?id=1457 ) * find -print0, xargs -0 and read -d ( https://austingroupbugs.net/view.php?id=243 ) * find -iname ( https://austingroupbugs.net/view.php?id=1031 * sed -E ( https://austingroupbugs.net/view.php?id=528 ) * set -o pipefail ( https://austingroupbugs.net/view.php?id=789 )

But `find -iname` always worked; why was it proposed again?

Post by dwheeler » Sun, Jun 16, 2024, 3:10 AM UTC

EuAndreh wrote: post #57

dwheeler wrote: post #26

Earlier quoted context omitted.

I agree! You can blame me for some of those proposals :-), my thanks to the POSIX team for getting this out the door. The sed -E option makes it easy to portably use extended regular expressions. The find -print0, xargs -0, and read -d provide portable ways to securely process lists of files. They were already widely implemented, but now they're officially part of the spec and can be counted on being present in many…

wow, I just realized you're the same dwheeler from the work on diverse double-compilation! Thanks for the improvements on POSIX, I've read many issues and discussions raised by you in the past couple of years. If fact, I think it was one of yoir comments on make(1)'s dynamic dependency graph that reassured me I had a correct grasp on its execution model!