Automount subsystem
The automount subsystem allows non-root users to mount remote file systems once the initial mount points are specified by the root user.
The /etc/auto_master file specifies this information.
These mount points, known as keys, have a corresponding maps that determine
which remote file system is mounted over it. The format of the /etc/auto_master file
is as follows:
/key mapNote: The /etc/auto_master file is read when the automount command
is initially executed, and changes to it will not take effect until the automount command
is run again.
The most common maps are direct maps, indirect maps, and host maps.