I tried to view file permissions
$ ll yaan/
ls: cannot access yaan/.: Permission denied
ls: cannot access yaan/Nenje Nenje - TamilTunes.com.mp3: Permission denied
ls: cannot access yaan/..: Permission denied
ls: cannot access yaan/Aathangara Orathil - TamilTunes.com.mp3: Permission denied
ls: cannot access yaan/Hey Lamba Lamba - TamilTunes.com.mp3: Permission denied
ls: cannot access yaan/list: Permission denied
ls: cannot access yaan/Latcham Calorie - TamilTunes.com.mp3: Permission denied
ls: cannot access yaan/Nee Vandhu Ponadhu - TamilTunes.com.mp3: Permission denied
total 0
d????????? ? ? ? ? ? ./
d????????? ? ? ? ? ? ../
-????????? ? ? ? ? ? Aathangara Orathil - TamilTunes.com.mp3
-????????? ? ? ? ? ? Hey Lamba Lamba - TamilTunes.com.mp3
-????????? ? ? ? ? ? Latcham Calorie - TamilTunes.com.mp3
-????????? ? ? ? ? ? list
-????????? ? ? ? ? ? Nee Vandhu Ponadhu - TamilTunes.com.mp3
-????????? ? ? ? ? ? Nenje Nenje - TamilTunes.com.mp3
valar@valar-Desktop:/song$ cd yaan/
bash: cd: yaan/: Permission denied
valar@valar-Desktop:/song$
Also I have tried to change file permission, but it doesn't throw error.
$ sudo chmod 644 yaan/
$
Also, I am not able to open the files. How do I recover them? Or change file permission and ownership?