The document explains the functionality of the sticky bit, which is a file permission modification used to prevent unprivileged users from removing or renaming files they do not own within a directory. It outlines scenarios involving file permissions, the use of the sticky bit, how to set and remove it, and its common implementation in directories like /tmp. By setting the sticky bit, users can create files in shared directories but are restricted to deleting or renaming only their own files.

1. How does Sticky Bit work?
Presented by Vinothini

2. File Permission
We can view the file permission by ls command.
ls -l file.txt
-rw-r--r-- 1 user user 3 Feb 24 19:18 file.txt

3. Scenario I
What does happen if alice tries to create / modifies file in a bob directory?

4. Scenario II
How to solve this problem?
Set write permission to directory

5. Scenario III
Drawback:
Any user can accidently delete other user files as all user have full permission.

6. Scenario IV

7. Sticky bit
Sticky bit is always called as restricted deletion bit.
It prevents unprivileged users from removing or renaming a file in the directory unless
they own the file or directory.
We can set sticky bit by chmod +t <directory name> and remove it by chmod -t
<directory name>.

8. Where do we see sticky bit in our system?
Sticky bit is found on directory like /tmp.
/tmp directory has all the rights on all three levels. As the users have write permission on
this directory, they can delete or rename any file in this directory.
By enabling sticky bit, anyone can create a file/directory in /tmp, but it allows to delete or
rename users own file.

9. Thank You