$ ls -R /proc/asound /sys/class/sound ls -R /proc/asound /sys/class/sound ls: cannot access /proc/asound: No such file or directory ls: cannot access /sys/class/sound: No such file or directory
$ ls -R /proc/asound /sys/class/sound
ls -R /proc/asound /sys/class/sound
ls: cannot access /proc/asound: No such file or directory
ls: cannot access /sys/class/sound: No such file or directory