Create and Manage Access Control Lists (ACLs)

# Not supported by most file systems by default are XFS and EXT4 
# Use ACLs when you want more fine grande permission 
# control than groups and users
getfacl {file}}

setfacl -m u:{username}}:{sembolic permissions such as example rw}}
# ls -l, has plus to show ACL stuff active

# chmod does not modify ACL, the mask can stop the ACL from doing what it wants

# Why would group ID change

# Default ACL

setfacl -d -m u:{user}}:{Permissions}} directory # -d is for default
setfacl --remove-default {directory}} # can also use -x

# How to remove permissions for specifc users and groups for a firectory or file
# -R for recursion
# One can skip the user or group for a acl to set default permissions