https://www.php.net/manual/zh/function.posix-initgroups.php
PHP: posix_initgroups - Manual
Calculate the group access list
phpposixmanual
https://www.w3schools.com/python/ref_os_initgroups.asp
Python os.initgroups()
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML...
pythonos
https://cygwin.com/pipermail/cygwin/2008-November/170484.html
sshd on vista error "initgroups: Permission denied" (cygwin-1.7)
permission deniedsshdvistaerrorcygwin