I have a system that boots and runs from an initramfs.
How can I tell how much free space I have in the file system ?
df doesn't show the file system at all e.g.
Filesystem Size Used Available Use% Mounted on
devtmpfs 228.2M 0 228.2M 0% /dev
tmpfs 242.9M 0 242.9M 0% /dev/shm
tmpfs 242.9M 2.7M