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why FHS of fc3 has been changed
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Because current versions of the FHS states that /mnt is only for temporary/one-off mounts, and /media should be used for anything regular or semi-permanent, such as CD or DVD ROM drives.
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whats purpose of shm in /etc/fstab
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POSIX shared memory - one application can write to and permit others access. The most common use I've seen for it is ATi's proprietary fglrx drivers.