my users permissions
 

Hello.
I have changed permissions of some main directories like (etc, bin, ..) from 755 (rwxr-xr-x) to 750 (rwxr-x---). I did that for not specified reason and it's normal that user was not be able to run programs or something else.
But I changed it back all by doing (chmod 755 /.../ -R) recursivesly and I still cannot do anything as normal user. Please help me someone. Thanx

What "things" are you trying to do as a normal user that you're currently having problems with ?

things
 

It's almost all ok now. I forgot to change /lib back.
But now I have all back (but not back exactly - I don't remember all subdirectories)
and this thing writes me if I login as user :
-bash: /dev/null : Permission Denied

And if I want to "su (root)"
this writes me:
su
password:***
su: cannot set groups: Operation not permitted.

I don't expecting some help but maybe somebody did this.