There are 2 situations when Linux can switch from user Space
to Kernel Space:-
1) by doing System calls
2) When interrupt comes (to handle interrupt)
3) by executing 128 (0x80 ) instruction or doing sysenter
Linux can switch from kernel Space to User space:-
1) process in kernel mode is preempted.
2) After completion of Interrupt handler / System call
3) performing sysexit sys call
What is /proc/self? a) a directory b) link to the currently running process c) it allows a process to look itself without having to know its process ID d) all of the mentioned
The file /proc version shows the version of ______ used in the system. a) kernel b) gcc c) both (a) and (b) d) none of the mentioned
The file /proc/locks displays the file currently locked by the a) kernel b) user c) superuser d) none of the mentioned
/bin/dmesg picks the messages from a) /proc/kmesg b) /sbin/klogd c) both (a) and (b) d) none of the mentioned
Which file contains the boot options passed to the kernel? a) /proc/cmdline b) /proc/root c) /proc/boot d) none of the mentioned
Which one of the following file contains the environment for the process? a) /proc/[PID]/environ b) /proc/[PID]/env c) /proc/[PID]/path d) none of the mentioned
What is /bin/sh? a) bourne shell b) hard or symbolic link to the real shell command c) bash shell d) both (b) and (c)
Which one of the directory does not contain binary files? a) /bin b) /sbin c) /etc d) none of the mentioned
Which one of the following package management command-line tools is the odd one out?
Indicate the right option to search for anything not a letter or number a) grep '^[a-zA-Z0-9]' b) grep '[^a-zA-Z0-9]' c) grep '[a-zA-Z0-9]' d) None of the above in Search Pattern
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