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The unshare command makes local filesystems unavailable for mounting by remote systems. The shared filesystem must correspond to a line with NFS as the FSType in the file /etc/dfs/sharetab.
If the filesystem being unshared is a symbolic link to a valid pathname, the canonical path (the path which the symbolic link follows) will be unshared.
For example, if /export/foo is a symbolic link to /export/bar (/export/foo -> /export/bar), the following unshare command will result in /export/bar as the unshared pathname (and not /export/foo).