UNIX Question and Answer – File System Administration
UNIX MCQ – Multiple Choice Questions for exam, interview, and Entrance Test
1. What command is used to perform a file system check in UNIX?
a) chkfs
b) fscheck
c) fsck
d) checkfs
Answer: c) fsck
Explanation: The fsck command is used to perform a file system check and repair any inconsistencies in UNIX.
2. Which option of the fsck command is used to automatically repair detected file system errors?
a) -p
b) -r
c) -f
d) -a
Answer: d) -a
Explanation: The -a option of the fsck command is used to automatically repair detected file system errors in UNIX.
3. What is the purpose of the df command in UNIX?
a) Display disk format
b) Display disk fragmentation
c) Display disk file system usage
d) Display disk firmware information
Answer: c) Display disk file system usage
Explanation: The df command is used to display information about disk space usage and file system usage in UNIX.
4. Which command is used to display the disk usage of files and directories in UNIX?
a) du
b) df
c) diskusage
d) spaceusage
Answer: a) du
Explanation: The du command is used to display the disk usage of files and directories in UNIX.
5. What is the purpose of the -h option in the du command?
a) Display usage in human-readable format
b) Display hidden files
c) Display hierarchical usage
d) Display hardware information
Answer: a) Display usage in human-readable format
Explanation: The -h option of the du command is used to display disk usage in a human-readable format in UNIX.
6. Which command is used to set disk quotas for users in UNIX?
a) quota
b) diskquota
c) setquota
d) userquota
Answer: a) quota
Explanation: The quota command is used to set disk quotas for users in UNIX, limiting their disk usage.
7. What is the purpose of disk quotas in UNIX?
a) Limit disk space usage for users
b) Increase disk performance
c) Control disk fragmentation
d) Monitor disk temperature
Answer: a) Limit disk space usage for users
Explanation: Disk quotas in UNIX are used to limit disk space usage for users, ensuring fair allocation and preventing misuse.
8. Which command is used to display disk quota usage for users in UNIX?
a) showquota
b) viewquota
c) quota
d) diskquota
Answer: c) quota
Explanation: The quota command is used to display disk quota usage for users in UNIX.
9. What is the purpose of the -m option in the quota command?
a) Display quota usage in megabytes
b) Display quota usage in megabits
c) Display quota in percentage
d) Display quota in human-readable format
Answer: a) Display quota usage in megabytes
Explanation: The -m option of the quota command is used to display quota usage in megabytes in UNIX.
10. Which command is used to set disk quotas for a specific file system in UNIX?
a) setquota
b) edquota
c) quotaset
d) fsquota
Answer: a) setquota
Explanation: The setquota command is used to set disk quotas for a specific file system in UNIX.
11. What is the purpose of the quotacheck command in UNIX?
a) Check disk quotas for users
b) Check disk usage for users
c) Update disk quota files
d) Update disk usage files
Answer: c) Update disk quota files
Explanation: The quotacheck command is used to update disk quota files in UNIX, ensuring accurate quota management.
12. Which command is used to display inode usage in UNIX?
a) iusage
b) inode
c) ls -i
d) df -i
Answer: d) df -i
Explanation: The df command with the -i option is used to display inode usage in UNIX.
13. What is the purpose of the -i option in the df command?
a) Display inode usage
b) Display disk format
c) Display disk information
d) Display disk fragmentation
Answer: a) Display inode usage
Explanation: The -i option of the df command is used to display inode usage in UNIX.
14. Which command is used to set soft limits for disk quotas in UNIX?
a) softquota
b) edquota
c) setquota
d) limits
Answer: b) edquota
Explanation: The edquota command is used to set soft limits for disk quotas in UNIX.
15. What is the purpose of the -t option in the quota command?
a) Display total disk usage
b) Display user quotas
c) Display group quotas
d) Display tree structure of directories
Answer: a) Display total disk usage
Explanation: The -t option of the quota command is used to display total disk usage in UNIX.
16. Which command is used to report file system disk space usage in UNIX?
a) usage
b) diskusage
c) du
d) df
Answer: d) df
Explanation: The df command is used to report file system disk space usage in UNIX.
17. What is the purpose of the -k option in the du command?
a) Display usage in kilobytes
b) Display hidden files
c) Display usage in human-readable format
d) Display kernel information
Answer: a) Display usage in kilobytes
Explanation: The -k option of the du command is used to display disk usage in kilobytes in UNIX.
18. Which command is used to display detailed information about disk space usage in UNIX?
a) diskusage
b) df -a
c) du -h
d) ls -l
Answer: c) du -h
Explanation: The du command with the -h option is used to display detailed information about disk space usage in UNIX.
19. What is the purpose of the -g option in the du command?
a) Display usage in gigabytes
b) Display group quotas
c) Display hidden files
d) Display usage in human-readable format
Answer: a) Display usage in gigabytes
Explanation: The -g option of the du command is used to display disk usage in gigabytes in UNIX.
20. Which command is used to set disk quotas for a specific user in UNIX?
a) userquota
b) setquota
c) edquota
d) quota
Answer: c) edquota
Explanation: The edquota command is used to set disk quotas for a specific user in UNIX.
21. What is the purpose of the -c option in the setquota command?
a) Check quota usage
b) Create new quota file
c) Clear existing quotas
d) Change quota configuration
Answer: b) Create new quota file
Explanation: The -c option of the setquota command is used to create a new quota file in UNIX.
22. Which command is used to display disk space usage statistics for all files and directories in a directory tree?
a) diskspace
b) treespace
c) du -s
d) du -a
Answer: d) du -a
Explanation: The du command with the -a option is used to display disk space usage statistics for all files and directories in a directory tree in UNIX.
23. What is the purpose of the -s option in the du command?
a) Display summary information
b) Display hidden files
c) Display usage in human-readable format
d) Display usage in kilobytes
Answer: a) Display summary information
Explanation: The -s option of the du command is used to display summary information, showing only the total disk usage for each specified directory.
24. Which command is used to display disk space usage for a specific file or directory in UNIX?
a) space
b) usage
c) df
d) du
Answer: d) du
Explanation: The du command is used to display disk space usage for a specific file or directory in UNIX.
25. What is the purpose of the -x option in the du command?
a) Exclude file system mount points
b) Include hidden files
c) Include system files
d) Display usage in human-readable format
Answer: a) Exclude file system mount points
Explanation: The -x option of the du command is used to exclude file system mount points from disk usage calculations in UNIX.
26. What is the purpose of the quotactl() system call in UNIX?
a) Set file permissions
b) Manage disk quotas
c) Display disk usage
d) Execute shell commands
Answer: b) Manage disk quotas
Explanation: The quotactl() system call is used to manage disk quotas in UNIX.
27. Which command is used to display the disk space usage of a specific file or directory in UNIX?
a) spaceusage
b) size
c) du
d) diskusage
Answer: c) du
Explanation: The du command is used to display the disk space usage of a specific file or directory in UNIX.
28. What is the purpose of the -l option in the df command?
a) Display usage in long format
b) Display usage in human-readable format
c) Display usage for local file systems only
d) Display usage for remote file systems only
Answer: c) Display usage for local file systems only
Explanation: The -l option of the df command is used to display disk usage for local file systems only in UNIX.
29. Which command is used to display the number of inodes used and available on a file system in UNIX?
a) inode
b) df -i
c) inodes
d) ls -i
Answer: b) df -i
Explanation: The df command with the -i option is used to display the number of inodes used and available on a file system in UNIX.
30. What is the purpose of the -t option in the df command?
a) Display total disk space
b) Display total disk usage
c) Display total inodes
d) Display total file systems
Answer: b) Display total disk usage
Explanation: The -t option of the df command is used to display total disk usage in UNIX.
31. Which command is used to set disk quotas for a specific group of users in UNIX?
a) groupquota
b) setquota
c) edquota
d) quota
Answer: c) edquota
Explanation: The edquota command is used to set disk quotas for a specific group of users in UNIX.
32. What is the purpose of the -u option in the quota command?
a) Display user quotas
b) Display group quotas
c) Display disk usage
d) Display summary information
Answer: a) Display user quotas
Explanation: The -u option of the quota command is used to display user quotas in UNIX.
33. Which command is used to report disk space usage statistics for the specified directory and its subdirectories in UNIX?
a) diskusage
b) spaceusage
c) du -h
d) du -d
Answer: d) du -d
Explanation: The du command with the -d option is used to report disk space usage statistics for the specified directory and its subdirectories in UNIX.
34. What is the purpose of the -h option in the df command?
a) Display usage in human-readable format
b) Display hidden files
c) Display usage for mounted file systems
d) Display usage in hierarchical format
Answer: a) Display usage in human-readable format
Explanation: The -h option of the df command is used to display disk usage in human-readable format in UNIX.
35. Which command is used to set disk quotas for a specific file system in UNIX?
a) setfsquota
b) fsquota
c) setquota
d) edquota
Answer: a) setfsquota
Explanation: The setfsquota command is used to set disk quotas for a specific file system in UNIX.
36. What is the purpose of the -x option in the du command?
a) Display usage in kilobytes
b) Exclude mount points
c) Display usage in human-readable format
d) Display usage for a specific user
Answer: b) Exclude mount points
Explanation: The -x option of the du command is used to exclude mount points from disk usage calculations in UNIX.
37. Which command is used to reset disk quotas for users in UNIX?
a) resetquota
b) clearquota
c) edquota
d) quota
Answer: b) clearquota
Explanation: The clearquota command is used to reset disk quotas for users in UNIX.
38. What is the purpose of the -n option in the quotacheck command?
a) Check quota usage
b) Create new quota file
c) Do not update quota file
d) Update quota file
Answer: c) Do not update quota file
Explanation: The -n option of the quotacheck command is used to perform a dry run and not update the quota file in UNIX.
39. Which command is used to set disk quotas for a specific project in UNIX?
a) setprojquota
b) projquota
c) edquota
d) quota
Answer: a) setprojquota
Explanation: The setprojquota command is used to set disk quotas for a specific project in UNIX.
40. What is the purpose of the -a option in the quota command?
a) Display all quotas
b) Display user quotas
c) Display group quotas
d) Display summary information
Answer: a) Display all quotas
Explanation: The -a option of the quota command is used to display all quotas in UNIX.
41. Which command is used to set soft limits for disk quotas in UNIX?
a) softquota
b) edquota
c) setquota
d) limits
Answer: b) edquota
Explanation: The edquota command is used to set soft limits for disk quotas in UNIX.
42. What is the purpose of the -r option in the df command?
a) Display total disk space
b) Display total disk usage
c) Display usage for remote file systems
d) Display usage for local file systems
Answer: c) Display usage for remote file systems
Explanation: The -r option of the df command is used to display disk usage for remote file systems in UNIX.
43. Which command is used to display disk space usage statistics for a specific file or directory in UNIX?
a) diskspace
b) spaceusage
c) du
d) diskusage
Answer: c) du
Explanation: The du command is used to display disk space usage statistics for a specific file or directory in UNIX.
44. What is the purpose of the -v option in the quotacheck command?
a) Perform a verbose check
b) Perform a quick check
c) Verify quota file integrity
d) Display version information
Answer: a) Perform a verbose check
Explanation: The -v option of the quotacheck command is used to perform a verbose check, displaying detailed information during the process in UNIX.
45. Which command is used to display disk space usage for a specific user in UNIX?
a) spaceusage
b) usage
c) du
d) diskusage
Answer: c) du
Explanation: The du command is used to display disk space usage for a specific user in UNIX.
46. What is the purpose of the -f option in the quotacheck command?
a) Specify quota file location
b) Perform a fast check
c) Display quota file contents
d) Check file system integrity
Answer: a) Specify quota file location
Explanation: The -f option of the quotacheck command is used to specify the location of the quota file in UNIX.
47. Which command is used to display disk space usage statistics for the specified directory and its subdirectories in UNIX?
a) diskspace
b) spaceusage
c) du -h
d) du -d
Answer: d) du -d
Explanation: The du command with the -d option is used to display disk space usage statistics for the specified directory and its subdirectories in UNIX.
48. What is the purpose of the -P option in the du command?
a) Display usage in human-readable format
b) Include hidden files
c) Follow symbolic links
d) Display usage in kilobytes
Answer: c) Follow symbolic links
Explanation: The -P option of the du command is used to follow symbolic links and calculate disk space usage accordingly in UNIX.
49. Which command is used to display disk space usage for a specific group of users in UNIX?
a) groupusage
b) groupdu
c) dgroup
d) du
Answer: d) du
Explanation: The du command is used to display disk space usage for a specific group of users in UNIX.
50. What is the purpose of the -g option in the quota command?
a) Display group quotas
b) Display user quotas
c) Display disk usage
d) Display summary information
Answer: a) Display group quotas
Explanation: The -g option of the quota command is used to display group quotas in UNIX.