Table of Contents

1. Challenge

   Find Custom Application Files under /opt/myapp and Display a Detailed Listing of Them

   We're going to need elevated privileges for this lab, so once we're logged in let's just become root right off with sudo -i.

   Use the find command to provide a detailed listing of the /opt/ directory:

   find /opt
   

   Our myapp directory is sitting in there, now let's see what happening in there as far as files go, like who owns them:

   find /opt/myapp -ls
   

   The root user owns everything. That's not good. We've got to change that.

2. Challenge

   Change the /opt/myapp Directory to be Owned by the cloud_user and the Group devop

   Use the chown command to change user ownership to the cloud_user and the group devop for the /opt/myapp directory and its contents:

   find /opt/myapp -exec sudo chown cloud_user:devop {} \;
   

   To test, run find /opt/myapp -ls again, and see if our chown command actually changed ownership on these files.

   It worked. Now we've got some permissions problems though.

3. Challenge

   Set Permissions for /opt/myapp Files

   Use the chmod command to set rw-rw----, or 660, permissions on all /opt/myapp files, except for the directory itself and the /opt/myapp/start.sh script:

   find /opt/myapp -name "d*" -ok chmod 660 {} \;
   

   Just type y for each yes/no prompt.

   Next, change permissions on anything that does not start with d (the directory itself and the start.sh script):

   find /opt/myapp '!' -name "d*" -ok chmod 770 {} \;
   

   Again, type y for each yes/no prompt.

4. Challenge

   Find a Directory under /home Which Is Not Owned by a User or Group

   Use the find command to find any directories in /home files which lack a user and group owner:

   find /home -nouser -nogroup -ls
   

5. Challenge

   Execute the chown Command with the find Command

   Find files and directories that were owned by devuser:

   find /home -ls
   

   Check for anything that doesn't have user or group ownership:

   find /home -nouser -a -nogroup -ls
   

   Run chown with find to modify files that have no current user or group ownership:

   sudo find /home -nouser -nogroup -exec sudo chown cloud_user:cloud_user {} \;
   

   Check that we got them all:

   find /home -nouser -a -nogroup -ls
   

   See if cloud_user owns them now:

   find /home/devuser -ls