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Which command is used to create a ISO9660 filesystem? (Specify ONLY the command without any path or parameters.)

In the following output from top, which processes contribute to the percentage of time that the CPU spends in the state of wa?
Tasks: 193 total, 1 running, 190 sleeping, 2 stopped, 0 zombie
Cpu(s): 0.5%us, 0.3%sy, 0.0%ni, 98.2%id, 1.0%wa, 0.0%hi, 0.0%si, 0.0%st

How can the kernel parameter for the maximum size of the shared memory segment (shmmax) be changed to 2GB (2147483648 Bytes) on a running system? (Choose TWO correct answers.)

Which of the following commands shows capabilities and usable frequencies for the wireless interface wlan0?

Which command is used to install a GRUB boot loader into the master boot record?