SSH / Shell Commands

Directgory:
list directory: ls -aF
list directgory slow privs: ls -l
create a symbolic link: ln -s <source-file-or-directory> <link-file-or-directory>
change file ownership <user>:<group>: chown -R USER:GROUP DIRECTORY

User & Group:
change a users password: passwd <username>
create user and assign group: useradd -G <group> <username>
list all groups: getent group
list groups for a user: id or id <username/groupname> or groups
create a group: groupadd <groupname>
add user to a group: usermod -a -G <groupname> <username>