mkdir: No such file or directory error -

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i trying mount file system using read only, getting error. 

# cd downloads # ls .localized # mkdir /mnt/temp mkdir: /mnt/temp: file exists #  mount -o ro,loop -t ext3 system1 /mnt/temp mount: exec /library/filesystems/ext3.fs/contents/resources/mount_ext3 /mnt/temp: no such file or directory`

why isn't /mnt/temp showing up? in sudo


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