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The account name "adm" is a standard account that comes pre-installed with AIX. It is used for system administration tasks and has specific roles and permissions associated with it. Attempting to create a new account with the same name would conflict with the existing standard account, hence it cannot be used for creating a new user account.References:= IBM AIX Documentation

Themount -acommand in AIX mounts all file systems that are specified in the/etc/filesystemsfile and have the attributemount=true. This ensures that only those file systems that are configured to be automatically mounted are actually mounted when this command is executed. It does not mount all defined file systems, only those marked for automatic mounting.References: IBM AIX Documentation – mount

Devices that are connected to the system can be in one of four states.

Devices that are connected to the system can be in one of the following states:

Item

Description

Undefined

The device is unknown to the system.

Defined

Specific information about the device is recorded in the customized database, but it is unavailable to the system.

Available

A defined device is coupled to the operating system, or the defined device is configured.

Stopped

The device is unavailable but remains known by its device driver.

If a tty device and a printer alternately use the same tty connector, both a tty device and a printer are defined on the same parent and port in the device configuration database. Only one of these devices can be configured at a time. When the tty connector is configured, the printer specific setup information is retained until it isconfigured again. The device is not removed; it is in the defined state. Maintaining a device in defined state retains customized information for a device that is not currently in use, either before it is first made available or while it is temporarily removed from the system.

If a device driver exists for a device, the device can be made available through the device driver.