You should be first asking how many people are writing POSIX shell scripts because they need their shell scripts to work with Debian and Ubuntu. * http://unix.

You should be first asking how many people are writing POSIX shell scripts because they need their shell scripts to work with Debian and Ubuntu. * http://unix.stackexchange.com/a/250965/5132 http://unix.stackexchange.com/a/250965/5132 * https://debian.org/doc/debian-policy/ch-files.html#s-scripts https://debian.org/doc/debian-policy/ch-files.html#s-scripts * http://manpages.ubuntu.com/manpages/xenial/en/man1/checkbashisms.1.html http://manpages.ubuntu.com/manpages/xenial/en/man1/checkbash... * http://manpages.ubuntu.com/manpages/xenial/en/man1/posh.1.html http://manpages.ubuntu.com/manpages/xenial/en/man1/posh.1.ht... The answer is, of course, lots of them; as there was a massive project to do exactly this in Debian and Ubuntu some years ago.