setfacl – ServerOK

The setfacl utility sets Access Control Lists (ACLs) of files and directories.

To install setfacl on Ubuntu/Debian, run

apt install acl

1	apt install acl

Here is an example, where we create 2 users, one user will be given access to folder inside another users home directory.

useradd -m --shell /bin/bash  user1
useradd -m --shell /bin/bash  user2
su - user1
mkdir share
setfacl -m u:user2:rwx share

useradd -m --shell /bin/bash user1

useradd -m --shell /bin/bash user2

su - user1

mkdir share

setfacl -m u:user2:rwx share

in setfacl, -m option is used to modify. u specify user, if you need to set acl for a group, use g instead of u.