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diff -up util-linux-2.23.2/sys-utils/mount.8.kzak util-linux-2.23.2/sys-utils/mount.8
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--- util-linux-2.23.2/sys-utils/mount.8.kzak	2015-06-24 10:44:54.888929869 +0200
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+++ util-linux-2.23.2/sys-utils/mount.8	2015-06-24 10:48:10.022436703 +0200
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@@ -865,9 +865,10 @@ Some of these options are only useful wh
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 .I /etc/fstab
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 file.
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-Some of these options could be enabled or disabled by default
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-in the system kernel. To check the current setting see the options
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-in /proc/mounts.
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+Some of these  options  could be enabled or disabled by default in the system
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+kernel.  To check the current setting see the options in /proc/mounts.  Note
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+that filesystems also have per-filesystem specific default mount options (see
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+for example tune2fs -l output for extN filesystems).
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 The following options apply to any filesystem that is being
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 mounted (but not every filesystem actually honors them - e.g., the
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@@ -973,6 +974,9 @@ For more details, see
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 .B defaults
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 Use default options:
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 .BR rw ", " suid ", " dev ", " exec ", " auto ", " nouser ", and " async.
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+
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+Note that the real set of the all default mount options depends on kernel
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+and filesystem type. See the begin of this section for more details.
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 .TP
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 .B dev
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 Interpret character or block special devices on the filesystem.