mount:tldr:9f7a2

The "mount -a" command is used in Linux/Unix systems to mount all the file systems listed in the /etc/fstab file.

Here's how it works:

1. The command "mount -a" is executed in the terminal.
2. It reads the /etc/fstab file, which is a configuration file that contains information about the file systems and partitions to be mounted on the system during startup.
3. It checks each entry in the /etc/fstab file and mounts the file systems that are not yet mounted.
4. If a file system cannot be mounted successfully (for example, if there are issues with the file system or device), it will display an error message.
5. Once all the file systems mentioned in /etc/fstab are mounted successfully, the command completes execution.

In summary, the "mount -a" command automates the process of mounting all file systems specified in /etc/fstab, ensuring that they are mounted correctly according to the configuration provided in the file.