# chown user1 file1
>> change owner of a file to user1
# chown -R user1:group directory1
>> change owner and group of a directory and all the contents inside it
# chgrp group1 file1
>> change group of files
# chmod ugo+rwx directory1
>> set permissions
# chmod go-rwx directory1
>> remove permits (rwx) from users (g0)
# ls -lh
>> permits on files
# groupadd [group]
>> create a new group
# groupdel [group]
>> delete a group
# groupmod -n dba oinstall
>> rename a group from dba to oinstall
# useradd -g dba -d /home/applmgr -s /bin/bash applmgr
>> create a new user "applmgr" belongs "dba" group with home directory /home/applmgr and default shell /bin/bash
# userdel -r oracle
>> delete a user oracle
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