How to give permissions to other user after logging as root in Linux?

Question

I have one machine which is machineA and I have a root access to that machine.

Now I need to create these below two directories and give permissions to app user.

Create ZooKeeper Data directory and give permissions to app : /opt/zookeeper/data
Create ZooKeeper Log directory and give permissions to app : /opt/zookeeper/log

I have already created those directories in /opt folder by logging as root -

root@machineA:/opt# ls -lt
drwxr-xr-x 4 root root 4096 Dec 17 13:46 zookeeper

root@machineA:/opt/zookeeper# ls -lt
drwxr-xr-x 2 root root 4096 Dec 17 13:46 log
drwxr-xr-x 2 root root 4096 Dec 17 13:45 data

Now I am not sure how to give permissions to app user as mentioned above? I believe this is pretty easy question but I am not sure how to do that?

Answer 1

Use chown to set user and group ownership of files and directories. For example:

chown -R app /opt/zookeeper

will recursively change ownership of that directory to user app.