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From: Glenn Morris <rgm@gnu.org>
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Subject: Re: Fixing dired hangs when NFS mount goes AWOL
Date: Wed, 05 Oct 2011 19:14:27 -0400
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But, -l is probably not an option for the default, because:

cd /path/to/remote/nfs
df -l .

  -> "df: no file systems processed"

which breaks Dired's "total used" line on healthy NFS mounts.