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Show Free Space from Terminal

To show the free space on a disk from Terminal

Use this command:
df -h
In the "Mounted on" column look for the name of the disk.
Free space is shown in the "Avail" column.

To show just the available space for a specific disk:
df -h | grep DISKNAME | awk '{print $4}'
Substitute DISKNAME with the name of the disk.

Show a summary of disk usage:
du -sh
This shows free space as a number (eg 304G).