By -

Directory modes

rwx -> full access

r-x -> limited access (enter, read)

--- -> no access

drwxr-x--- - directory permissions

su root, su iam - switch user

gpasswd -A bob projectX - user bob now is administrator of this group

su bob

gpasswd -a alice projectX (Adding user alice to group projectX)

gpasswd -d candy projectX

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