UNIX Question and Answer – System Information
UNIX MCQ – Multiple Choice Questions for exam, interview, and Entrance Test
1. Which command is used to display detailed information about the system’s memory usage, including swap space utilization?
a) meminfo
b) free
c) vmstat
d) top
Answer: b) free
Explanation: The free command displays detailed information about the system’s memory usage, including swap space utilization, in UNIX.
2. What does the lsblk command display in UNIX?
a) List of USB devices
b) List of block devices
c) List of PCI devices
d) List of system users
Answer: b) List of block devices
Explanation: The lsblk command displays the list of block devices, such as hard drives and partitions, in UNIX.
3. Which command is used to display information about network interfaces, including IP addresses and MAC addresses?
a) ifconfig
b) ipconfig
c) netstat
d) route
Answer: a) ifconfig
Explanation: The ifconfig command displays information about network interfaces, including IP addresses and MAC addresses, in UNIX.
4. What does the arp -a command display in UNIX?
a) List of currently active users
b) List of active network connections
c) ARP cache entries
d) System hardware information
Answer: c) ARP cache entries
Explanation: The arp -a command displays ARP cache entries, which contain mappings between IP addresses and MAC addresses, in UNIX.
5. Which command is used to display information about the system’s hardware configuration, including CPU, memory, and storage devices?
a) hwinfo
b) lshw
c) lspci
d) lsusb
Answer: b) lshw
Explanation: The lshw command displays information about the system’s hardware configuration, including CPU, memory, and storage devices, in UNIX.
6. What does the uptime command display in UNIX?
a) Current system time
b) System load average and uptime
c) CPU information
d) Network interface configuration
Answer: b) System load average and uptime
Explanation: The uptime command displays the system load average and uptime in UNIX.
7. Which command is used to display information about the system’s CPU architecture, including the number of processors and their capabilities?
a) cpuinfo
b) lscpu
c) top
d) vmstat
Answer: b) lscpu
Explanation: The lscpu command displays information about the system’s CPU architecture, including the number of processors and their capabilities, in UNIX.
8. What does the netstat -r command display in UNIX?
a) List of active network connections
b) Routing table
c) ARP cache
d) System uptime and load average
Answer: b) Routing table
Explanation: The netstat -r command displays the routing table in UNIX.
9. Which command is used to display information about active and listening sockets, including their state and addresses?
a) ss
b) netstat
c) ifconfig
d) route
Answer: a) ss
Explanation: The ss command is used to display information about active and listening sockets, including their state and addresses, in UNIX.
10. What does the ps -aux command display in UNIX?
a) List of currently logged-in users
b) List of active network connections
c) Detailed information about all processes
d) System uptime and load average
Answer: c) Detailed information about all processes
Explanation: The ps -aux command displays detailed information about all processes running on the system in UNIX.
11. Which command is used to display information about system memory usage and swap space utilization in UNIX?
a) meminfo
b) free
c) vmstat
d) top
Answer: b) free
Explanation: The free command displays information about system memory usage and swap space utilization in UNIX.
12. What does the cat /proc/version command display in UNIX?
a) System uptime and load average
b) Kernel version and build information
c) CPU information
d) Network interface configuration
Answer: b) Kernel version and build information
Explanation: The cat /proc/version command displays the kernel version and build information in UNIX.
13. Which command is used to display information about available disk space, including disk usage and mount points?
a) du
b) df
c) fsstat
d) cat /etc/fstab
Answer: b) df
Explanation: The df command displays information about available disk space, including disk usage and mount points, in UNIX.
14. What does the cat /proc/mounts command display in UNIX?
a) List of currently logged-in users
b) Detailed information about all mounted filesystems
c) Detailed information about all processes
d) System uptime and load average
Answer: b) Detailed information about all mounted filesystems
Explanation: The cat /proc/mounts command displays detailed information about all mounted filesystems in UNIX.
15. Which command is used to display information about active and passive TCP/UDP connections, including their state and port numbers?
a) tcpdump
b) netstat
c) ifconfig
d) route
Answer: b) netstat
Explanation: The netstat command is used to display information about active and passive TCP/UDP connections, including their state and port numbers, in UNIX.
16. What does the cat /proc/loadavg command display in UNIX?
a) System uptime and load average
b) Kernel version and build information
c) CPU information
d) Memory information
Answer: a) System uptime and load average
Explanation: The cat /proc/loadavg command displays the system uptime and load average in UNIX.
17. Which command is used to display information about active network connections, including local and remote addresses and their states?
a) ss
b) netstat
c) ifconfig
d) route
Answer: b) netstat
Explanation: The netstat command is used to display information about active network connections, including local and remote addresses and their states, in UNIX.
18. What does the uname -m command display in UNIX?
a) System uptime and load average
b) CPU architecture
c) Kernel version
d) System hardware information
Answer: b) CPU architecture
Explanation: The uname -m command displays the CPU architecture in UNIX.
19. Which command is used to display information about active processes and their resource usage in UNIX?
a) ps
b) top
c) pstree
d) process
Answer: a) ps
Explanation: The ps command is used to display information about active processes and their resource usage in UNIX.
20. What does the ip a command display in UNIX?
a) Network interface configuration
b) System uptime and load average
c) Memory information
d) Currently logged-in users
Answer: a) Network interface configuration
Explanation: The ip a command displays network interface configuration in UNIX.
21. Which command is used to display information about the system’s memory usage, including total, used, and free memory?
a) meminfo
b) free
c) vmstat
d) top
Answer: b) free
Explanation: The free command displays detailed information about the system’s memory usage in UNIX.
22. What does the lsusb command display in UNIX?
a) CPU information
b) USB devices connected to the system
c) Memory information
d) Network interface configuration
Answer: b) USB devices connected to the system
Explanation: The lsusb command displays the list of USB devices connected to the system in UNIX.
23. Which command is used to display information about the system’s hardware configuration, including CPU, memory, and storage devices?
a) hwinfo
b) lshw
c) lspci
d) lsusb
Answer: b) lshw
Explanation: The lshw command displays information about the system’s hardware configuration, including CPU, memory, and storage devices, in UNIX.
24. What does the uptime command display in UNIX?
a) Current system time
b) System load average and uptime
c) CPU information
d) Network interface configuration
Answer: b) System load average and uptime
Explanation: The uptime command displays the system load average and uptime in UNIX.
25. Which command is used to display information about the system’s CPU architecture, including the number of processors and their capabilities?
a) cpuinfo
b) lscpu
c) top
d) vmstat
Answer: b) lscpu
Explanation: The lscpu command displays information about the system’s CPU architecture, including the number of processors and their capabilities, in UNIX.
26. Which command is used to display information about active network connections and their corresponding processes in UNIX?
a) netstat -p
b) lsof -i
c) ifconfig
d) route
Answer: b) lsof -i
Explanation: The lsof -i command displays information about active network connections and their corresponding processes in UNIX.
27. What does the cat /proc/cpuinfo command display in UNIX?
a) CPU temperature
b) Detailed CPU information
c) Available CPU cycles
d) CPU utilization history
Answer: b) Detailed CPU information
Explanation: The cat /proc/cpuinfo command displays detailed information about the system’s CPU in UNIX.
28. Which command is used to display detailed information about USB devices connected to the system in UNIX?
a) lsusb -v
b) lspci
c) lshw
d) lsblk
Answer: a) lsusb -v
Explanation: The lsusb -v command displays detailed information about USB devices connected to the system in UNIX.
29. What does the ip addr show command display in UNIX?
a) List of currently active network interfaces
b) Network interface configuration
c) ARP cache
d) System uptime and load average
Answer: b) Network interface configuration
Explanation: The ip addr show command displays network interface configuration in UNIX.
30. Which command is used to display detailed information about network interfaces, including their status and statistics, in UNIX?
a) netstat -i
b) ifconfig -a
c) ip link show
d) route -n
Answer: c) ip link show
Explanation: The ip link show command displays detailed information about network interfaces in UNIX.
31. What does the df -T command display in UNIX?
a) Detailed disk usage statistics
b) Filesystem type
c) CPU temperature
d) List of currently active network interfaces
Answer: b) Filesystem type
Explanation: The df -T command displays the filesystem type for each mounted filesystem in UNIX.
32. Which command is used to display detailed information about filesystems, including their type, size, and usage, in UNIX?
a) lsblk
b) du
c) df -h
d) mount
Answer: c) df -h
Explanation: The df -h command displays detailed information about filesystems, including their type, size, and usage, in UNIX.
33. What does the cat /proc/meminfo command display in UNIX?
a) System uptime and load average
b) Memory information
c) CPU information
d) Disk usage statistics
Answer: b) Memory information
Explanation: The cat /proc/meminfo command displays information about memory usage in UNIX.
34. Which command is used to display information about the system’s memory and swap space usage in UNIX?
a) top
b) free -m
c) vmstat
d) ps -aux
Answer: b) free -m
Explanation: The free -m command displays information about the system’s memory and swap space usage in UNIX.
35. What does the cat /proc/sys/kernel/version command display in UNIX?
a) System uptime and load average
b) Kernel version
c) CPU information
d) Disk usage statistics
Answer: b) Kernel version
Explanation: The cat /proc/sys/kernel/version command displays the kernel version in UNIX.
36. Which command is used to display information about filesystem usage, including inode usage, in UNIX?
a) df -i
b) du
c) lsblk
d) mount
Answer: a) df -i
Explanation: The df -i command displays information about filesystem usage, including inode usage, in UNIX.
37. What does the cat /proc/uptime command display in UNIX?
a) CPU temperature
b) System uptime
c) Kernel version
d) Network interface configuration
Answer: b) System uptime
Explanation: The cat /proc/uptime command displays the system uptime in UNIX.
38. Which command is used to display information about the system’s memory and swap space usage in UNIX?
a) top
b) free -m
c) vmstat
d) ps -aux
Answer: b) free -m
Explanation: The free -m command displays information about the system’s memory and swap space usage in UNIX.
39. What does the cat /proc/sys/kernel/version command display in UNIX?
a) System uptime and load average
b) Kernel version
c) CPU information
d) Disk usage statistics
Answer: b) Kernel version
Explanation: The cat /proc/sys/kernel/version command displays the kernel version in UNIX.
40. Which command is used to display information about filesystem usage, including inode usage, in UNIX?
a) df -i
b) du
c) lsblk
d) mount
Answer: a) df -i
Explanation: The df -i command displays information about filesystem usage, including inode usage, in UNIX.
41. What does the cat /proc/uptime command display in UNIX?
a) CPU temperature
b) System uptime
c) Kernel version
d) Network interface configuration
Answer: b) System uptime
Explanation: The cat /proc/uptime command displays the system uptime in UNIX.
42. Which command is used to display detailed information about the system’s memory and swap space usage in UNIX?
a) meminfo
b) free -h
c) vmstat
d) top
Answer: b) free -h
Explanation: The free -h command displays detailed information about the system’s memory and swap space usage in UNIX.
43. What does the cat /proc/loadavg command display in UNIX?
a) CPU utilization statistics
b) System uptime and load average
c) Kernel version
d) Disk usage statistics
Answer: b) System uptime and load average
Explanation: The cat /proc/loadavg command displays the system uptime and load average in UNIX.
44. Which command is used to display information about system load average, including 1-minute, 5-minute, and 15-minute averages, in UNIX?
a) uptime
b) top
c) loadavg
d) vmstat
Answer: a) uptime
Explanation: The uptime command displays information about system load average in UNIX.
45. What does the cat /proc/cpuinfo command display in UNIX?
a) System uptime and load average
b) Detailed CPU information
c) Memory information
d) Disk usage statistics
Answer: b) Detailed CPU information
Explanation: The cat /proc/cpuinfo command displays detailed information about the system’s CPU in UNIX.
46. Which command is used to display information about the system’s memory usage and swap space utilization in UNIX?
a) meminfo
b) free -m
c) vmstat
d) top
Answer: b) free -m
Explanation: The free -m command displays information about the system’s memory usage and swap space utilization in UNIX.
47. What does the cat /proc/loadavg command display in UNIX?
a) CPU utilization statistics
b) System uptime and load average
c) Kernel version
d) Disk usage statistics
Answer: b) System uptime and load average
Explanation: The cat /proc/loadavg command displays the system uptime and load average in UNIX.
48. Which command is used to display information about system load average, including 1-minute, 5-minute, and 15-minute averages, in UNIX?
a) uptime
b) top
c) loadavg
d) vmstat
Answer: a) uptime
Explanation: The uptime command displays information about system load average in UNIX.
49. What does the cat /proc/cpuinfo command display in UNIX?
a) System uptime and load average
b) Detailed CPU information
c) Memory information
d) Disk usage statistics
Answer: b) Detailed CPU information
Explanation: The cat /proc/cpuinfo command displays detailed information about the system’s CPU in UNIX.
50. Which command is used to display information about the system’s memory usage and swap space utilization in UNIX?
a) meminfo
b) free -m
c) vmstat
d) top
Answer: b) free -m
Explanation: The free -m command displays information about the system’s memory usage and swap space utilization in UNIX.
