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# mount -n -o remount,ro /
-n Mount without writing in /etc/mtab. This is necessary
for example when /etc is on a read-only file system. (这个选项是必须的)
-o Options are specified with a -o flag followed by a
comma separated string of options. Some of these
options are only useful when they appear in the
/etc/fstab file. The following options apply to any
file system that is being mounted (but not every file
system actually honors them - e.g., the sync option
today has effect only for ext2, ext3, fat, vfat and
ufs): |
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