This is RHCE notes i wrote while studding for the exam, it doesn’t cover all exam topics, maybe they can help you to review what did you studied no more.. User Administration: - adduser UserName - deluser UserName - usermod: to modifiy user information.. - chage: change expiration date for user account. - always when you use a directory as a share for a group, use SGID, for ex: chmod 2770 /share-dir for login/logout scripts and bash, refer to this topic: bash loging, startup scripts and shell initialization files ACL: mount with acl, ex: mount -o remount, acl /dev/sda5 /home as root: touch /home/idle-boy/a getfacl /home/idle-boy/a getfacl: Removing leading ‘/’ from absolute path names # file: home/idle-boy/a # owner: root # group: root user::rw- group::r– other::r– setfacl -m u:idle-boy:rw -m g:idle-boy:rwx /home/idle-boy/a getfacl: Removing leading ‘/’ from absolute path names # file: home/idle-boy/a # owner: root # group: root user::rw- user:idle-boy:rw- group::r– group:idle-boy