Special permissions - sgid

 SGID(set group ID):-

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-> it is applied  for dir to change the ownerships of  a dir recursively for upcoming files & dir in that perticular dir

-> it is represented by "s"  and in terms of numbers we have "2".

to apply SGID:-

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#chmod g+s  <directory path>

ex: #chmod g+s  /root/d1

#ls -ld  /root/d1

drwxr-sr-x   --  ---- ---- /root/d1

remove the SGID permission:-

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#chmod g-s   /root/d1

stick bit:-

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-> it is used to enforce other users from deleting  files & dir created by root user or normal user.

-> it is applied for others

-> it is represented by "t"  it terms of numbers "1"

-> it can only be applied for dir but not files

to apply sticky bit:-

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#chmod o+t <file/dir name>