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I have an sshfs FUSE filesystem mounted in ~/mountpoint. I tried umount mountpoint and diskutil unmount mountpoint (on a Mac here) and both failed. I used sshfs -o IdentityFile=<key> user@hostname:/home/<user> ~/mountpoint; none of that required sudo.

Why, then, do unmount it do I need sudo privilges?

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up vote 11 down vote accepted

Because umount only allows root to unmount regular filesystems.

You can, however, unmount any FUSE filesystem (inclusing sshfs) without using sudo:

fusermount -u mountpoint
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yes, but I have no command fusermount installed; I believe it is linux-specific. But thanks - I didn't know umount was sudo-only – kalaracey May 13 '12 at 7:52

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