Which of the following are init systems used within Linux systems? (Choose THREE correct answers.)
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A. B. C. D. E.BCE
The init system is the first process started during boot and is responsible for starting and stopping system services. The init system is used to bring the system to a running state, and it is responsible for running all other system processes. There are several init systems used within Linux systems, and in this question, we need to choose three of them. Let's go through each option:
A. startd - This is not an init system used in Linux. Therefore, it is not a correct answer.
B. systemd - This is a widely used init system on modern Linux systems. systemd is a system and service manager that replaces the traditional SysV init system. It is designed to provide a faster boot process and to manage system processes more efficiently. It uses a "unit" file to define and manage services, targets, and sockets.
C. Upstart - This is an init system developed by Canonical, the company behind Ubuntu Linux. It was designed to improve boot time and provide better event management capabilities. However, Upstart is no longer used in modern Linux distributions, and it has been replaced by systemd.
D. SysInit - This is not an init system used in Linux. Therefore, it is not a correct answer.
E. SysV init - This is the traditional init system used in many Linux distributions. It uses scripts located in the /etc/init.d directory to manage system services. However, SysV init has some limitations, such as slow startup times, and it has been replaced by systemd in many modern Linux distributions.
Therefore, the correct answers are B. systemd, C. Upstart, and E. SysV init.