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I am creating a bash script to unmount my usb drive after the backup is done. To unmount the drive I use the command:

diskutil unmount disk4s1

But sometimes when I plug my usb drive it gets a different dev name, as disk3s1, or disk2s1. I need add a line in my script before unmount the disk, to get the dev name associated to my volume name.

What command could I use to get the dev name given its volume name?

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mount | grep /Volumes/foo | cut -d ' ' -f1

or

mount | awk '/Volumes\/foo/ { print $1 }'
  • Thank you!. This is my bash code to unmount myvolume working perfect now : devname=$(mount | grep /Volumes/myvolume | cut -d ' ' -f1); osascript -e 'do shell script "diskutil unmount '$devname'" ' – bunset May 28 '16 at 22:15
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You can just use the volume name with diskutil though, there's no need to get the identifier:

$ diskutil unmount VolumeName
Volume VolumeName on disk1s1 unmounted

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