Can I prevent users from seeing dir contents?
 

Is there a way that I can prevent other users from seeing outsider directories?

For example if I have the following

/home/usera
/home/userb

Is there a way I can prevent userb from being able to change to /home/usera ? If not is there a way at least I can prevent userb from being able to any of the file contents in /home/usera/ ?

I believe you need to use chmod

calcon

Yep, just change permissions to allow only the owner of that directory to view it.

the command to do that could be

chmod 700 /home/usera

which you would have to run as user a or root

Thanks for the response all. I ended up doing it with chmod o= /home/usera

Is chmod 700 /home/usera the numerical equivilant?

No, you'd need go= to get the equivalent of numeric 0700.