A method allowing a user interfacing a computer with a console, to delay the execution of system administration operations and to have them executed in unattended mode on said computer. The method comprises the first step of seizing identification of the user at the console and checking authorization. If user authorized the method comprises the step of seizing at the console and storing in a working storage area the characteristics of the system currently active on the computer, parameters describing the administration operations to be performed on the computer, the type of system restart to be performed after administration operations in unattended mode the delay to be waited for before starting said administration operations. Then, the method requires to the operating system of the computer to start delay. When delay is expired, the method initializes the computer peripherals according to the parameters describing the administration operations stored in the working storage area and sets the operating system in a sleeping state. Then, the administration operations are performed according to the administration operations parameters stored in the working storage. Finally, the characteristics of the system which was active on the computer and the type of system restart are retrieved from the working storage and the system is restarted according to the retrieved information.