Ubuntu Linux File System Permissions

ubuntu-file-permissions.md

Root /

drwxr-xr-x root root bin/
drwxr-xr-x root root boot/
drwxr-xr-x root root cdrom/
drwxr-xr-x root root dev/
drwxr-xr-x root root etc/
drwxr-xr-x root root home/
lrwxrwxrwx root root initrd.img -> boot/initrd.img-3.8.0-22-generic
lrwxrwxrwx root root initrd.img.old -> /boot/initrd.img-3.8.0-22-generic
drwxr-xr-x root root lib/
drwx------ root root lost+found/
drwxr-xr-x root root media/
drwxr-xr-x root root mnt/
drwxr-xr-x root root opt/
dr-xr-xr-x root root proc/
drwx------ root root root/
drwxr-xr-x root root .rpmdb/
drwxr-xr-x root root run/
drwxr-xr-x root root sbin/
drwxr-xr-x root root selinux/
drwxr-xr-x root root srv/
dr-xr-xr-x root root sys/
drwxrwxrwt root root tmp/
drwxr-xr-x root root usr/
drwxr-xr-x root root var/
lrwxrwxrwx root root vmlinuz -> boot/vmlinuz-3.8.0-22-generic
lrwxrwxrwx root root vmlinuz.old -> boot/vmlinuz-3.8.0-22-generic

/var

drwxr-xr-x root root     backups/
drwxr-xr-x root root     cache/
drwxrwsrwt root whoopsie crash/
drwxr-xr-x root root     lib/
drwxrwsr-x root staff    local/
lrwxrwxrwx root root     lock -> /run/lock/
drwxr-xr-x root root     log/
drwxrwsr-x root mail     mail/
drwxrwsrwt root whoopsie metrics/
drwxr-xr-x root root     opt/
lrwxrwxrwx root root     run -> /run/
drwxr-xr-x root root     spool/
drwxrwxrwt root root     tmp/
drwxr-xr-x root root     www/

/var/lib everything 0755 root:root except those

drwxr-xr-x avahi-autoipd avahi-autoipd avahi-autoipd/
drwxr-xr-x colord        colord        colord/
drwxrwsr-x libuuid       libuuid       libuuid/
drwxr-x--- lightdm       lightdm       lightdm/
drwx------ mysql         mysql         mysql/
drwx-wx-wt root          root          php5/
drwxr-xr-x root          root          plymouth/
drwx------ root          root          polkit-1/
lrwxrwxrwx root          root          python-support -> /usr/lib/pymodules/
drwx------ root          root          sudo/
drwx------ root          root          udisks2/
drwxr-xr-x root          root          usb_modeswitch/

/var/lib/myslq

-rw-r--r-- root  root  debian-5.5.flag
-rw-rw---- mysql mysql ibdata1
-rw-rw---- mysql mysql ib_logfile0
-rw-rw---- mysql mysql ib_logfile1
drwx------ mysql root  mysql/
-rw-rw---- root  root  mysql_upgrade_info
drwx------ mysql mysql performance_schema/
drwx------ mysql root  test/

/var/lib/myslq/mysql/ 0660 mysql:mysql those are your databases

/var/lib/myslq/performance_schema/ 0660 mysql:mysql

/var/lib/myslq/test/ 0660 mysql:mysql

/var/lib/sudo

drwx------ root user user/

/var/lib/sudo/user 0600 root:user

/var/lib/lightdm

drwxrwxr-x lightdm lightdm .cache/
drwxrwxr-x lightdm lightdm .config/
drwx------ lightdm lightdm .dbus/
drwx------ lightdm lightdm .gconf/
drwxrwxr-x lightdm lightdm .local/
-rw-rw-r-- lightdm lightdm .Xauthority