Mounting a Filesystem in Multiple Places Simultaneously

Introduction

Some might say: "There's no need for this, just use symbolic links with ln -s". But I disagree - it's really not the same thing. This approach allows you to have a global view of a particular directory.

For example, if I want to mount /var/jails in /jails, it's possible and here's the result once done:

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Filesystem     Size    Used   Avail Capacity  Mounted on
/dev/ad4s1a    989M    129M    782M    14%    /
devfs          1.0K    1.0K      0B   100%    /dev
/dev/ad4s1d    224G    1.4G    204G     1%    /usr
/dev/ad4s1e    224G    4.0M    206G     0%    /var
/var/jails     224G    4.0M    206G     0%    /jails

Commands

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mount --bind /folder1 /folder2

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mount -t nullfs /folder1 /folder2