Linux Sysfs Question:
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The directories of /sys directory:
a) are created at system startup when the subsystems register themselves with object core
b) are created when any device is connects with the system
c) are created at the time of kernel compilation
d) none of the mentioned

Answer:

a) are created at system startup when the subsystems register themselves with kobject core

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The directory /sys/block contains:
a) sub-directories for each block device
b) symbolic link for each block device only
c) device file for each block device only
d) none of the mentioned		What is sysfs?
a) it is a virtual filesystem
b) users use it to get the information about the running kernel
c) it is used for exporting kernel objects.
d) all of the mentioned