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Using Octal Permissions to Set up a Collaboration Area
In a multi-user environment like Linux, there will come a need to have a specific area set aside for different uses to collaborate. This lab will walk through the process and make sure you understand how different permissions can work together.
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Challenge
Ensure /opt/collab Can Be Accessed by the Other Managers but Not Will
The first thing we need to do is make sure Bob, Adam, and Sally are all members of the same group. This will allow us to use octal permissions on the group section to allow access.
If we run
id bob,id adam, andid sally, we'll see that they're all members of themanagersgroup.So we can run
chown bob.managers /opt/collabandchmod 770 /opt/collabto lock the directory down to Bob and themanagersgroup. -
Challenge
Ensure Files Written Can Be Read by All Users
As
bob,adam, andsally, touch a file in/opt/collaband then try andcatall of those files as those 3 users.Adam failed. Let's look at why.
The permissions on
adam's file are 600, so his user can access the file but the other managers can't. If we checkadam's.bash_profilewe see his umask is set incorrectly for this task. Edit his.bash_profileand set his umask to 026 and try this again.
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