Ils disent ici qu'il faut suivre les instructions de la. Sauf qu'il n'y a pas groupadd ou useradd sous mac os x depuis un moment

J'ajoute donc l'user et le group mysql ainsi, mais les changements de owner me font n'imp:
sh-3.2# ls -la
total 0
drwxr-xr-x 10 root wheel 340 Oct 18 20:34 .
drwxr-xr-x 8 root wheel 272 Oct 18 20:34 ..
drwxr-xr-x 41 root wheel 1394 Oct 18 20:34 bin
drwxr-xr-x 4 root wheel 136 Oct 18 20:34 docs
drwxr-xr-x 3 root wheel 102 Oct 18 20:34 include
drwxr-xr-x 3 root wheel 102 Oct 18 20:34 lib
drwxr-xr-x 4 root wheel 136 Oct 18 20:34 libexec
drwxr-xr-x 15 root wheel 510 Oct 18 20:34 mysql-test
drwxr-xr-x 5 root wheel 170 Oct 18 20:34 share
drwxr-xr-x 29 root wheel 986 Oct 18 20:34 sql-bench
sh-3.2# chgrp -R mysql /usr/local/mysql/
sh-3.2# ls -la
total 0
drwxr-xr-x 10 root nobody 340 Oct 18 20:34 .
drwxr-xr-x 8 root wheel 272 Oct 18 20:34 ..
drwxr-xr-x 41 root nobody 1394 Oct 18 20:34 bin
drwxr-xr-x 4 root nobody 136 Oct 18 20:34 docs
drwxr-xr-x 3 root nobody 102 Oct 18 20:34 include
drwxr-xr-x 3 root nobody 102 Oct 18 20:34 lib
drwxr-xr-x 4 root nobody 136 Oct 18 20:34 libexec
drwxr-xr-x 15 root nobody 510 Oct 18 20:34 mysql-test
drwxr-xr-x 5 root nobody 170 Oct 18 20:34 share
drwxr-xr-x 29 root nobody 986 Oct 18 20:34 sql-bench
sh-3.2# chgrp -R wheel /usr/local/mysql/
sh-3.2# ls -la
total 0
drwxr-xr-x 10 root wheel 340 Oct 18 20:34 .
drwxr-xr-x 8 root wheel 272 Oct 18 20:34 ..
drwxr-xr-x 41 root wheel 1394 Oct 18 20:34 bin
drwxr-xr-x 4 root wheel 136 Oct 18 20:34 docs
drwxr-xr-x 3 root wheel 102 Oct 18 20:34 include
drwxr-xr-x 3 root wheel 102 Oct 18 20:34 lib
drwxr-xr-x 4 root wheel 136 Oct 18 20:34 libexec
drwxr-xr-x 15 root wheel 510 Oct 18 20:34 mysql-test
drwxr-xr-x 5 root wheel 170 Oct 18 20:34 share
drwxr-xr-x 29 root wheel 986 Oct 18 20:34 sql-bench
sh-3.2# chown -R mysql /usr/local/mysql/
sh-3.2# ls -la
total 0
drwxr-xr-x 10 nobody wheel 340 Oct 18 20:34 .
drwxr-xr-x 8 root wheel 272 Oct 18 20:34 ..
drwxr-xr-x 41 nobody wheel 1394 Oct 18 20:34 bin
drwxr-xr-x 4 nobody wheel 136 Oct 18 20:34 docs
drwxr-xr-x 3 nobody wheel 102 Oct 18 20:34 include
drwxr-xr-x 3 nobody wheel 102 Oct 18 20:34 lib
drwxr-xr-x 4 nobody wheel 136 Oct 18 20:34 libexec
drwxr-xr-x 15 nobody wheel 510 Oct 18 20:34 mysql-test
drwxr-xr-x 5 nobody wheel 170 Oct 18 20:34 share
drwxr-xr-x 29 nobody wheel 986 Oct 18 20:34 sql-bench
sh-3.2# man chown
sh-3.2# chown -R root /usr/local/mysql/
sh-3.2# ls -la
total 0
drwxr-xr-x 10 root wheel 340 Oct 18 20:34 .
drwxr-xr-x 8 root wheel 272 Oct 18 20:34 ..
drwxr-xr-x 41 root wheel 1394 Oct 18 20:34 bin
drwxr-xr-x 4 root wheel 136 Oct 18 20:34 docs
drwxr-xr-x 3 root wheel 102 Oct 18 20:34 include
drwxr-xr-x 3 root wheel 102 Oct 18 20:34 lib
drwxr-xr-x 4 root wheel 136 Oct 18 20:34 libexec
drwxr-xr-x 15 root wheel 510 Oct 18 20:34 mysql-test
drwxr-xr-x 5 root wheel 170 Oct 18 20:34 share
drwxr-xr-x 29 root wheel 986 Oct 18 20:34 sql-bench
sh-3.2#
ca me met "nobody". Comment je cree un user? Comment je cree un group? Je parle de user et group au sens ceux qu'on voit quand on fait ls -la.