Essential Linux Proc Filesystem Interview Questions & Answers:

1. Which one of the directory does not contain binary files?
a) /bin
b) /sbin
c) /etc
d) none of the mentioned

c) /etc

2. 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)

b) hard or symbolic link to the real shell command

3. 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

a) /proc/[PID]/environ

4. Which file contains the boot options passed to the kernel?
a) /proc/cmdline
b) /proc/root
c) /proc/boot
d) none of the mentioned

c) /proc/boot

5. /bin/dmesg picks the messages from:
a) /proc/kmesg
b) /sbin/klogd
c) both (a) and (b)
d) none of the mentioned

a) /proc/kmesg

6. The file /proc/locks displays the file currently locked by the:
a) kernel
b) user
c) superuser
d) none of the mentioned

a) kernel

7. 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

c) both (a) and (b)

8. 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

d) all of the mentioned

9. The /sbin/sysctl command is used to:
a) view kernel settings in the /proc/sys/ directory
b) set kernel settings in the /proc/sys/ directory
c) automate kernel settings in the /proc/sys/ directory
d) all of the mentioned

d) all of the mentioned

10. The file /proc/kcore displays a size of:
a) RAM
b) RAM plus 4 KB
c) RAM plus 8 KB
d) none of the mentioned

b) RAM plus 4 KB

11. The file /proc/execdomains lists the:
a) execution domains currently supported by the linux kernel
b) all domains of all processes
c) registered ISA DMA channel in use
d) none of the mentioned

a) execution domains currently supported by the linux kernel

12. For the system having one processor, the processor identifying number in the file /proc/cpuinfo is:
a) 0
b) 1
c) 2
d) 3

b) 1

13. Which file shows the parameter passed to kernel at the time of starting?
a) /proc/apm
b) /proc/cmdline
c) both (a) and (b)
d) none of the mentioned

b) /proc/cmdline

14. Which file is used primarily for diagnosing memory fragmentation issues?
a) /proc/buddyinfo
b) /proc/meminfo
c) /proc/apm
d) none of the mentioned

a) /proc/buddyinfo

15. The command "echo www.globalguideline.com > /proc/sys/kernel/hostname" will:
a) change the hostname
b) print "www.globalguideline.com"
c) do nothing
d) none of the mentioned

a) change the hostname

16. The directory /proc/net contains information about:
a) different network system compiled into the system
b) IP address of the system
c) MAC address of the system
d) none of the mentioned

a) different network system compiled into the system

17. The files of /proc directory are
a) stored in secondary memory
b) generated by the kernel
c) both (a) and (b)
d) none of the mentioned

b) generated by the kernel

18. Accessing the file /proc/meminfo gives the different result each time because:
a) memory usages is always fluctuating
b) a new process id is assigned
c) logical address is different from the physical address
d) none of the mentioned

a) memory usages is always fluctuating

19. Proc files are:
a) read-only files
b) read-write files
c) both (a) and (b)
d) none of the mentioned

c) both (a) and (b)

20. Most files and directories within /proc are 0 bytes in size because:
a) proc filesystem exists only as a reflection of the in-memory kernel data structure
b) these files contains very only one or two instructions
c) both(a) and (b)
d) none of the mentioned

a) proc filesystem exists only as a reflection of the in-memory kernel data structure

21. With the help of proc filesystem:
a) kernel and kernel modules can send the information to processes
b) process information can be accessed
c) both (a) and (b)
d) none of the mentioned

c) both (a) and (b)

22. The file /proc/[PID]/mountinfo contains:
a) major minor numbers of device files
b) root of the mount within the filesystem
c) mount point relative to the process's root
d) all of the mentioned

d) all of the mentioned

23. Which one of the following command will print the environment of process 1?
a) cat /proc/1/environ
b) cat /proc/bin/1/env
c) cat /proc/1/var/env
d) none of the mentioned

a) cat /proc/1/environ

24. The command "cd /proc/10/cwd" provides the:
a) current working directory of process having PID 10
b) current status of the process having PID 10
c) current version of the filesystem
d) none of the mentioned

a) current working directory of process having PID 10

25. /proc/tty contains the information about:
a) current terminal
b) all terminals
c) both (a) and (b)
d) none of the mentioned

a) current terminal

26. The file /proc/swaps contains the:
a) list of active swap partitions
b) sizes of the swap partitions
c) priorities of the swap partitions
d) all of the mentioned

d) all of the mentioned

27. The buddy algorithm handles the:
a) memory fragmentation
b) DHCP server
c) routing
d) none of the mentioned

a) memory fragmentation

28. The list of available frame buffers are stored in:
a) /proc/[PID]/fb
b) /proc/fb
c) /proc/etc/fb
d) none of the mentioned

b) /proc/fb

29. The directory /proc/[PID]/tasks contains:
a) hard links to any task that have been started by this process
b) files that containing tasks that have been started by this process
c) sub-direcories of various tasks
d) none of the mentioned

a) hard links to any task that have been started by this process

30. Which one of the following is a sym-link to the root path as seen by the process?
a) /proc/[PID]/root
b) /proc/[PID]/path
c) both (a) and (b)
d) none of the mentioned

a) /proc/[PID]/root

31. What is /proc/[PID]/cwd?
a) symbolic link to current directory of the process
b) regular file containing the information about the current status of the process
c) directory containing various sub-directories
d) none of the mentioned

a) symbolic link to current directory of the process

32. Which one of the following contains various bits of information about the state of power management?
a) /proc/acpi
b) /proc/apm
c) both (a) and (b)
d) none of the mentioned

c) both (a) and (b)

33. Obtaining of the PID can be done by the utility:
a) pgrep
b) pidof
c) ps
d) all of the mentioned

d) all of the mentioned

34. Which one of the following operating system does not supports proc filesystem?
a) IBM AIX
b) QNX
c) Solaries
d) none of the mentioned

d) none of the mentioned

35. /proc/partitions contains:
a) major number of each partition
b) minor number of each partition
c) number of block and partition name
d) all of the mentioned

d) all of the mentioned