How to make sound work again in a MacOS without a reboot

Sometimes, sound output in a MacBook laptop is gone. To restart the sound driver, kill the coreaudiod service - it will restart automatically and sound output will be restored:

John-MacBook-Pro:~ eyal$ ps -ax|grep corea

81524 ??         0:00.08 /System/Library/Frameworks/LocalAuthentication.framework/Support/coreauthd

82158 ??         0:00.35 /usr/sbin/coreaudiod

82163 ttys001    0:00.00 grep corea

John-MacBook-Pro:~ eyal$ sudo pkill coreaudiod

John-MacBook-Pro:~ eyal$ ps -ax|grep corea

81524 ??         0:00.08 /System/Library/Frameworks/LocalAuthentication.framework/Support/coreauthd

82167 ??         0:00.30 /usr/sbin/coreaudiod

82172 ttys001    0:00.00 grep corea

How to find the number of used inodes in MacOS

Run:
df -i

Review the iused (number of used inodes) and ifree (number of free inodes) columns.

For example:

MacBook-Pro:test john$ df -i

Filesystem                 512-blocks      Used Available Capacity     iused               ifree %iused  Mounted on

/dev/disk1s1                236363688 188549552  35981312    84%     1566306 9223372036853209501    0%   /

devfs                             446       446         0   100%         772                   0  100%   /dev

/dev/disk1s4                236363688  10486264  35981312    23%           6 9223372036854775801    0%   /private/var/vm

map -hosts                          0         0         0   100%           0                   0  100%   /net

map auto_home                       0         0         0   100%           0                   0  100%   /home

drivefs                      62914560  17491136  45423424    28% 18446744069414597893          4294967295 135917654504970528%   /Volumes/GoogleDrive

/Applications/WhatsApp.app  236363688 190972936  33558008    86%     1568482 9223372036853207325    0%   /private/var/folders/3m/21wz80ms2xjc3wh5kljn6z7w0000gn/T/AppTranslocation/83EAF769-7FB7-4710-AD83-DD825BA7E042