UNIX Question and Answer – UNIX’s Process Monitoring
UNIX MCQ – Multiple Choice Questions for exam, interview, and Entrance Test
1. Which command is used to display information about system processes and their resource usage sorted by process status in UNIX?
a) ps -S
b) ps -stat
c) ps -status
d) ps -st
Answer: b) ps -stat
Explanation: The ps command with the -stat option is used to display information about system processes and their resource usage sorted by process status in UNIX.
2. What signal is used to send a “terminate” signal to a process in UNIX?
a) SIGSTOP
b) SIGTERM
c) SIGKILL
d) SIGINT
Answer: b) SIGTERM
Explanation: The SIGTERM signal is used to send a “terminate” signal to a process in UNIX.
3. Which command is used to display information about system processes and their resource usage sorted by command name in UNIX?
a) ps -cmd
b) ps -args
c) ps -c
d) ps -comm
Answer: d) ps -comm
Explanation: The ps command with the -comm option is used to display information about system processes and their resource usage sorted by command name in UNIX.
4. What is the purpose of the vmstat command in UNIX?
a) Display virtual memory statistics
b) Display disk space statistics
c) Display network statistics
d) Display process statistics
Answer: a) Display virtual memory statistics
Explanation: The vmstat command is used to display virtual memory statistics in UNIX.
5. Which signal is used to send a “kill” signal to a process in UNIX?
a) SIGKILL
b) SIGTERM
c) SIGINT
d) SIGSTOP
Answer: a) SIGKILL
Explanation: The SIGKILL signal is used to send a “kill” signal to a process in UNIX.
6. What command is used to display information about system processes and their resource usage sorted by time in UNIX?
a) ps -T
b) ps -time
c) ps -start-time
d) ps -start
Answer: c) ps -start-time
Explanation: The ps command with the -start-time option is used to display information about system processes and their resource usage sorted by time in UNIX.
7. Which signal is used to send a “stop” signal to a process in UNIX?
a) SIGSTOP
b) SIGTSTP
c) SIGCONT
d) SIGINT
Answer: a) SIGSTOP
Explanation: The SIGSTOP signal is used to send a “stop” signal to a process in UNIX.
8. What command is used to display information about system processes and their resource usage sorted by memory in UNIX?
a) ps -m
b) ps -mem
c) ps -memory
d) ps -rss
Answer: b) ps -mem
Explanation: The ps command with the -mem option is used to display information about system processes and their resource usage sorted by memory in UNIX.
9. Which signal is used to send a “continue” signal to a process in UNIX?
a) SIGCONT
b) SIGSTOP
c) SIGTSTP
d) SIGINT
Answer: a) SIGCONT
Explanation: The SIGCONT signal is used to send a “continue” signal to a process in UNIX.
10. What is the purpose of the sar command in UNIX?
a) Display system information
b) Display swap space information
c) Display CPU utilization information
d) Display process information
Answer: c) Display CPU utilization information
Explanation: The sar command is used to display CPU utilization information in UNIX.
11. Which command is used to display information about system processes and their resource usage sorted by user in UNIX?
a) ps -U
b) ps -user
c) ps -u
d) ps -username
Answer: c) ps -u
Explanation: The ps command with the -u option is used to display information about system processes and their resource usage sorted by user in UNIX.
12. What is the purpose of the iostat command in UNIX?
a) Display CPU utilization statistics
b) Display disk I/O statistics
c) Display memory utilization statistics
d) Display network statistics
Answer: b) Display disk I/O statistics
Explanation: The iostat command is used to display disk I/O statistics in UNIX.
13. Which signal is used to send a “hangup” signal to a process and its children in UNIX?
a) SIGHUP
b) SIGTERM
c) SIGKILL
d) SIGINT
Answer: a) SIGHUP
Explanation: The SIGHUP signal is used to send a “hangup” signal to a process and its children in UNIX.
14. What command is used to display information about system processes and their resource usage sorted by process ID in UNIX?
a) ps -P
b) ps -p
c) ps -pid
d) ps -process
Answer: b) ps -p
Explanation: The ps command with the -p option is used to display information about system processes and their resource usage sorted by process ID in UNIX.
15. Which signal is used to terminate a process and its children gracefully and then immediately in UNIX?
a) SIGTERM
b) SIGKILL
c) SIGSTOP
d) SIGINT
Answer: b) SIGKILL
Explanation: The SIGKILL signal is used to terminate a process and its children gracefully and then immediately in UNIX.
16. What command is used to display information about system processes and their resource usage sorted by thread in UNIX?
a) ps -thread
b) ps -T
c) ps -th
d) ps -threads
Answer: b) ps -T
Explanation: The ps command with the -T option is used to display information about system processes and their resource usage sorted by thread in UNIX.
17. Which command is used to display information about system processes and their resource usage sorted by start time in UNIX?
a) ps -s
b) ps -S
c) ps -starttime
d) ps -start
Answer: c) ps -starttime
Explanation: The ps command with the -starttime option is used to display information about system processes and their resource usage sorted by start time in UNIX.
18. What is the purpose of the nice command in UNIX?
a) Adjust process priority
b) Terminate processes
c) Display CPU usage
d) Display memory usage
Answer: a) Adjust process priority
Explanation: The nice command is used to adjust the priority of processes in UNIX.
19. Which command is used to display information about system processes and their resource usage sorted by virtual memory in UNIX?
a) ps -v
b) ps -V
c) ps -vsz
d) ps -virtual
Answer: c) ps -vsz
Explanation: The ps command with the -vsz option is used to display information about system processes and their resource usage sorted by virtual memory in UNIX.
20. What is the purpose of the time command in UNIX?
a) Display system time
b) Measure command execution time
c) Set system time
d) Display process time
Answer: b) Measure command execution time
Explanation: The time command is used to measure the execution time of commands in UNIX.
21. Which signal is used to suspend a process temporarily and allow it to be resumed later in UNIX?
a) SIGSTOP
b) SIGTSTP
c) SIGCONT
d) SIGINT
Answer: b) SIGTSTP
Explanation: The SIGTSTP signal is used to suspend a process temporarily and allow it to be resumed later in UNIX.
22. What command is used to display information about system processes and their resource usage sorted by CPU utilization in UNIX?
a) ps -c
b) ps -C
c) ps -cpu
d) ps -%CPU
Answer: d) ps -%CPU
Explanation: The ps command with the -%CPU option is used to display information about system processes and their resource usage sorted by CPU utilization in UNIX.
23. Which command is used to display information about system processes and their resource usage sorted by user in a detailed format in UNIX?
a) ps -d
b) ps -U
c) ps -u
d) ps -user-detail
Answer: b) ps -U
Explanation: The ps command with the -U option is used to display information about system processes and their resource usage sorted by user in a detailed format in UNIX.
24. What is the purpose of the sar command in UNIX?
a) Display system information
b) Display swap space information
c) Display CPU utilization information
d) Display process information
Answer: c) Display CPU utilization information
Explanation: The sar command is used to display CPU utilization information in UNIX.
25. Which command is used to display information about system processes and their resource usage sorted by resident memory in UNIX?
a) ps -m
b) ps -rss
c) ps -mem
d) ps -RES
Answer: b) ps -rss
Explanation: The ps command with the -rss option is used to display information about system processes and their resource usage sorted by resident memory in UNIX.
26. Which command is used to display a dynamic real-time view of the running processes in UNIX?
a) pstat
b) pstree
c) top
d) psview
Answer: c) top
Explanation: The top command provides a dynamic real-time view of the running processes in UNIX.
27. What signal is used to send a “terminate” signal to a process and its children in UNIX?
a) SIGSTOP
b) SIGTERM
c) SIGINT
d) SIGKILL
Answer: b) SIGTERM
Explanation: The SIGTERM signal is used to send a “terminate” signal to a process and its children in UNIX.
28. Which command is used to display detailed information about a specific process in UNIX?
a) procdetails
b) ps -d
c) pidinfo
d) pinfo
Answer: d) pinfo
Explanation: The pinfo command is used to display detailed information about a specific process in UNIX.
29. What is the purpose of the renice command in UNIX?
a) Renaming processes
b) Adjusting process priority
c) Resuming suspended processes
d) Terminating processes by name
Answer: b) Adjusting process priority
Explanation: The renice command is used to adjust the priority of processes in UNIX.
30. Which command is used to display information about system processes and their resource usage sorted by process group in UNIX?
a) ps -g
b) ps -group
c) ps -process-group
d) ps -pgid
Answer: a) ps -g
Explanation: The ps command with the -g option is used to display information about system processes and their resource usage sorted by process group in UNIX.
31. What signal is used to send a “stop” signal to a process and its children in UNIX?
a) SIGSTOP
b) SIGTSTP
c) SIGCONT
d) SIGINT
Answer: a) SIGSTOP
Explanation: The SIGSTOP signal is used to send a “stop” signal to a process and its children in UNIX.
32. Which command is used to display the current system load average in UNIX?
a) load
b) sysload
c) uptime
d) top
Answer: c) uptime
Explanation: The uptime command displays the current system load average among other information in UNIX.
33. What is the purpose of the prstat command in UNIX?
a) Display process status
b) Display CPU statistics
c) Display memory statistics
d) Display process statistics
Answer: d) Display process statistics
Explanation: The prstat command is used to display process statistics in UNIX.
34. Which command is used to display information about system processes and their resource usage sorted by time in UNIX?
a) ps -T
b) ps -t
c) ps -time
d) ps -start-time
Answer: c) ps -time
Explanation: The ps command with the -time option is used to display information about system processes and their resource usage sorted by time in UNIX.
35. What is the purpose of the vmstat command in UNIX?
a) Display system memory statistics
b) Display virtual memory statistics
c) Display CPU usage statistics
d) Display disk I/O statistics
Answer: b) Display virtual memory statistics
Explanation: The vmstat command displays virtual memory statistics in UNIX.
36. Which signal is used to send a “continue” signal to a process and its children in UNIX?
a) SIGCONT
b) SIGSTOP
c) SIGTSTP
d) SIGINT
Answer: a) SIGCONT
Explanation: The SIGCONT signal is used to send a “continue” signal to a process and its children in UNIX.
37. What is the purpose of the ls command in UNIX?
a) List system processes
b) List directory contents
c) List active users
d) List system services
Answer: b) List directory contents
Explanation: The ls command is used to list directory contents in UNIX.
38. Which command is used to display information about system processes and their resource usage sorted by process ID in UNIX?
a) ps -P
b) ps -pid
c) ps -p
d) ps -process
Answer: c) ps -p
Explanation: The ps command with the -p option is used to display information about system processes and their resource usage sorted by process ID in UNIX.
39. What is the purpose of the sar command in UNIX?
a) Display system information
b) Display swap space information
c) Display CPU utilization information
d) Display process information
Answer: c) Display CPU utilization information
Explanation: The sar command is used to display CPU utilization information in UNIX.
40. Which command is used to display information about system processes and their resource usage sorted by resident memory in UNIX?
a) ps -m
b) ps -rss
c) ps -mem
d) ps -RES
Answer: b) ps -rss
Explanation: The ps command with the -rss option is used to display information about system processes and their resource usage sorted by resident memory in UNIX.
41. What command is used to display information about system processes and their resource usage sorted by thread in UNIX?
a) ps -T
b) ps -threads
c) ps -thread
d) ps -th
Answer: a) ps -T
Explanation: The ps command with the -T option is used to display information about system processes and their resource usage sorted by thread in UNIX.
42. Which command is used to display information about system processes and their resource usage sorted by start time in UNIX?
a) ps -S
b) ps -s
c) ps -starttime
d) ps -start
Answer: c) ps -starttime
Explanation: The ps command with the -starttime option is used to display information about system processes and their resource usage sorted by start time in UNIX.
43. What is the purpose of the nice command in UNIX?
a) Adjust process priority
b) Terminate processes
c) Display CPU usage
d) Display memory usage
Answer: a) Adjust process priority
Explanation: The nice command is used to adjust the priority of processes in UNIX.
44. Which command is used to display information about system processes and their resource usage sorted by virtual memory in UNIX?
a) ps -v
b) ps -V
c) ps -vsz
d) ps -virtual
Answer: c) ps -vsz
Explanation: The ps command with the -vsz option is used to display information about system processes and their resource usage sorted by virtual memory in UNIX.
45. What is the purpose of the time command in UNIX?
a) Display system time
b) Measure command execution time
c) Set system time
d) Display process time
Answer: b) Measure command execution time
Explanation: The time command is used to measure the execution time of commands in UNIX.
46. Which signal is used to suspend a process temporarily and allow it to be resumed later in UNIX?
a) SIGSTOP
b) SIGTSTP
c) SIGCONT
d) SIGINT
Answer: b) SIGTSTP
Explanation: The SIGTSTP signal is used to suspend a process temporarily and allow it to be resumed later in UNIX.
47. What is the purpose of the prstat command in UNIX?
a) Display process status
b) Display CPU statistics
c) Display memory statistics
d) Display process statistics
Answer: d) Display process statistics
Explanation: The prstat command is used to display process statistics in UNIX.
48. Which command is used to display information about system processes and their resource usage sorted by time in UNIX?
a) ps -T
b) ps -t
c) ps -time
d) ps -start-time
Answer: c) ps -time
Explanation: The ps command with the -time option is used to display information about system processes and their resource usage sorted by time in UNIX.
49. What is the purpose of the vmstat command in UNIX?
a) Display system memory statistics
b) Display virtual memory statistics
c) Display CPU usage statistics
d) Display disk I/O statistics
Answer: b) Display virtual memory statistics
Explanation: The vmstat command displays virtual memory statistics in UNIX.
50. Which signal is used to send a “continue” signal to a process and its children in UNIX?
a) SIGCONT
b) SIGSTOP
c) SIGTSTP
d) SIGINT
Answer: a) SIGCONT
Explanation: The SIGCONT signal is used to send a “continue” signal to a process and its children in UNIX.
