**File Permission on Linux**

a) Fstab file explanation
<code bash>
ro = read only (cdrom)
rw = read write
nosuid = prevents set user identifier
noexec = no execution of file
noauto = mounted manually, not mounted at boot
users = all users can mount filesystem, by default only superuser can mount 
acl = access control list
usrquota = user quota
grpquota = group quota
</code>

b) Mount Command to show mounted devices
<code bash>
mount
</code>

c) Mount everything that is not defined as auto
<code bash>
mount -a
</code>

d) Mount devices
<code bash>
mount /dev/sda1 /media/yourdirectory
</code>

d) Mount devices with filesystem type, -t for type
<code bash>
mount -t ext4 /dev/sda1 /media/yourdirectory
</code>