What data is contained in the /etc/fstab file and what is it used for?

The /etc/fstab file in Linux and Unix-like systems contains information about file systems that should be automatically mounted at system startup or when needed.

This file lists devices (e.g., disk partitions), mount points, file system types, mount options, and parameters such as access rights and error handling.

An example line from /etc/fstab:

/dev/sda1   /   ext4   defaults   0 1

Here:

• /dev/sda1 — device (disk partition)
• / — mount point (root file system)
• ext4 — file system type
• defaults — mount options
• 0 and 1 — parameters for dump and fsck utilities

Thus, /etc/fstab is used to automate the mounting process and manage file systems during system startup and operation.