UNIX Question and Answer – File System Structure
UNIX MCQ – Multiple Choice Questions for exam, interview, and Entrance Test
1. Which command is used to create a symbolic link with a specific name in UNIX?
a) slink
b) link -s
c) ln -s
d) symlink
Answer: c) ln -s
Explanation: The ln -s command is used to create symbolic links in UNIX, with the -s option specifying that it should be a symbolic link.
2. What is the purpose of the chattr command in UNIX?
a) Change file attributes
b) Change file ownership
c) Change file permissions
d) Change file timestamps
Answer: a) Change file attributes
Explanation: The chattr command is used to change file attributes, such as making a file immutable or append-only, in UNIX.
3. Which command is used to display the inode structure of a file in UNIX?
a) stat
b) file
c) ls -i
d) inode
Answer: a) stat
Explanation: The stat command is used to display detailed information about files in UNIX, including their inode structure.
4. What is the purpose of the umount command in UNIX?
a) Mount a file system
b) Unmount a file system
c) Check file system integrity
d) Display file system information
Answer: b) Unmount a file system
Explanation: The umount command is used to detach a mounted file system in UNIX.
5. Which command is used to change the group ownership of a file or directory in UNIX?
a) chgrp
b) chown
c) chmod
d) grpchg
Answer: a) chgrp
Explanation: The chgrp command is used to change the group ownership of a file or directory in UNIX.
6. What is the purpose of the ln command with the -i option in UNIX?
a) Create symbolic links interactively
b) Create hard links interactively
c) Move files interactively
d) Remove files interactively
Answer: b) Create hard links interactively
Explanation: The ln command with the -i option prompts the user before overwriting existing files during a hard link creation operation in UNIX.
7. Which command is used to create a new empty file with a specific name in UNIX?
a) touch
b) create
c) newfile
d) mkfile
Answer: a) touch
Explanation: The touch command is used to create a new empty file with a specific name in UNIX.
8. What is the purpose of the chmod command with the -R option in UNIX?
a) Change file permissions recursively
b) Change file permissions interactively
c) Change file permissions forcibly
d) Change file permissions to read-only
Answer: a) Change file permissions recursively
Explanation: The chmod command with the -R option is used to change file permissions recursively in UNIX, applying changes to all files and subdirectories within a directory.
9. Which command is used to display the contents of a file starting from the end in UNIX?
a) cat
b) head
c) tail
d) more
Answer: c) tail
Explanation: The tail command is used to display the contents of a file starting from the end in UNIX.
10. What is the purpose of the ln command with the -t option in UNIX?
a) Create hard links
b) Create symbolic links
c) Create temporary files
d) Create links in a specific directory
Answer: d) Create links in a specific directory
Explanation: The ln command with the -t option specifies a target directory where the links should be created in UNIX.
11. Which command is used to display the contents of a file in hexadecimal format in UNIX?
a) hexdump
b) hdump
c) hexview
d) dump
Answer: a) hexdump
Explanation: The hexdump command is used to display the contents of a file in hexadecimal format in UNIX.
12. What is the purpose of the tar command with the -x option in UNIX?
a) Create archives
b) Extract files from an archive
c) Compress files
d) List files in an archive
Answer: b) Extract files from an archive
Explanation: The tar command with the -x option is used to extract files from an archive in UNIX.
13. Which command is used to display the number of files and directories within a directory in UNIX?
a) ls -l
b) ls -a
c) ls -R
d) ls -F
Answer: c) ls -R
Explanation: The ls -R command is used to display the contents of a directory recursively in UNIX, including subdirectories and their contents.
14. What is the purpose of the find command with the -exec option in UNIX?
a) Execute a command on files found by find
b) Display detailed information about files found by find
c) Print file names found by find
d) Change permissions of files found by find
Answer: a) Execute a command on files found by find
Explanation: The find command with the -exec option is used to execute a command on files found by find in UNIX.
15. Which command is used to change the file system label in UNIX?
a) fslabel
b) chfs
c) e2label
d) tunefs
Answer: c) e2label
Explanation: The e2label command is used to change the file system label in UNIX, particularly for ext2 and ext3 file systems.
16. What is the purpose of the file command with the -i option in UNIX?
a) Display file information
b) Determine file type
c) Change file attributes
d) Display file contents
Answer: b) Determine file type
Explanation: The file command with the -i option is used to determine the file type in UNIX.
17. Which command is used to change the access and modification timestamps of a file in UNIX?
a) touch
b) stamp
c) timestamp
d) settime
Answer: a) touch
Explanation: The touch command is used to change the access and modification timestamps of a file in UNIX.
18. What is the purpose of the ln command with the -v option in UNIX?
a) Create symbolic links
b) Create hard links
c) Display what is being done
d) Remove links
Answer: c) Display what is being done
Explanation: The ln command with the -v option is used to display what is being done, showing a verbose output in UNIX.
19. Which command is used to display the disk space usage of a file in UNIX?
a) du
b) df
c) diskusage
d) space
Answer: a) du
Explanation: The du command is used to display the disk space usage of a file or directory in UNIX.
20. What is the purpose of the mkfs command in UNIX?
a) Mount a file system
b) Unmount a file system
c) Format a file system
d) Check file system integrity
Answer: c) Format a file system
Explanation: The mkfs command is used to format a file system in UNIX, preparing it for use.
21. Which command is used to create a new directory with a specific name in UNIX?
a) makedir
b) createdir
c) mkdir
d) newdir
Answer: c) mkdir
Explanation: The mkdir command is used to create a new directory with a specific name in UNIX.
22. What is the purpose of the split command in UNIX?
a) Merge files
b) Split files into smaller parts
c) Copy files
d) Compress files
Answer: b) Split files into smaller parts
Explanation: The split command is used to split files into smaller parts in UNIX, often used for distributing large files.
23. Which command is used to display the file system type of a mounted file system in UNIX?
a) fsinfo
b) ftype
c) df
d) fstype
Answer: c) df
Explanation: The df command is used to display information about mounted file systems in UNIX, including their type.
24. What is the purpose of the pwd command with the -P option in UNIX?
a) Print working directory
b) Print physical working directory
c) Print word count of files
d) Print file details
Answer: b) Print physical working directory
Explanation: The pwd command with the -P option is used to print the physical working directory, resolving symbolic links in UNIX.
25. Which command is used to display the owner and group of a file in UNIX?
a) fileinfo
b) stat
c) ls -l
d) owngrp
Answer: c) ls -l
Explanation: The ls -l command is used to display detailed information about files in UNIX, including their owner and group.
26. Which command is used to change the timestamp of a file to a specific date and time in UNIX?
a) touch -t
b) time -set
c) timestamp -c
d) date -modify
Answer: a) touch -t
Explanation: The touch command with the -t option is used to change the timestamp of a file to a specific date and time in UNIX.
27. What is the purpose of the sync command in UNIX?
a) Synchronize file contents with disk
b) Synchronize file permissions
c) Synchronize file ownership
d) Synchronize file timestamps
Answer: a) Synchronize file contents with disk
Explanation: The sync command in UNIX flushes file system buffers and ensures that all pending data is written to disk, synchronizing file contents.
28. Which command is used to display the disk usage of a specific directory in UNIX?
a) disk
b) usage
c) df -h
d) du -h
Answer: d) du -h
Explanation: The du command with the -h option is used to display the disk usage of a specific directory in a human-readable format in UNIX.
29. What is the purpose of the umask command in UNIX?
a) Display current user
b) Set default permissions for newly created files
c) Mount a file system
d) Unmount a file system
Answer: b) Set default permissions for newly created files
Explanation: The umask command is used to set the default permissions for newly created files and directories in UNIX.
30. Which command is used to remove a directory and its contents forcefully in UNIX?
a) rmdir
b) rm -r
c) remove -f
d) deltree
Answer: b) rm -r
Explanation: The rm command with the -r option is used to remove a directory and its contents recursively in UNIX, forcefully.
31. What is the purpose of the ln command with the -i option in UNIX?
a) Create hard links interactively
b) Create symbolic links interactively
c) Display what is being done
d) Remove links interactively
Answer: a) Create hard links interactively
Explanation: The ln command with the -i option prompts the user before overwriting existing files during a hard link creation operation in UNIX.
32. Which command is used to display the inode number of a file in UNIX?
a) stat
b) inode
c) ls -i
d) fileinfo
Answer: c) ls -i
Explanation: The ls -i command is used to display the inode number of a file in UNIX.
33. What is the purpose of the du command with the -s option in UNIX?
a) Display summary of disk usage
b) Display disk usage of files and directories recursively
c) Sort disk usage results
d) Display disk usage in a human-readable format
Answer: a) Display summary of disk usage
Explanation: The du command with the -s option is used to display a summary of disk usage for the specified files and directories in UNIX.
34. Which command is used to create a new directory with specific permissions in UNIX?
a) mkdir -m
b) mkd
c) newdir -p
d) create -p
Answer: a) mkdir -m
Explanation: The mkdir command with the -m option is used to create a new directory with specific permissions in UNIX.
35. What is the purpose of the cp command with the -i option in UNIX?
a) Copy files interactively
b) Copy files forcefully
c) Copy files silently
d) Copy files recursively
Answer: a) Copy files interactively
Explanation: The cp command with the -i option prompts the user before overwriting existing files during a copy operation in UNIX.
36. Which command is used to display the number of lines, words, and characters in a file in UNIX?
a) stats
b) wc
c) count
d) lines
Answer: b) wc
Explanation: The wc command is used to display the number of lines, words, and characters in a file in UNIX.
37. What is the purpose of the truncate command in UNIX?
a) Change file permissions
b) Change file timestamps
c) Change file size
d) Change file ownership
Answer: c) Change file size
Explanation: The truncate command is used to change the size of a file in UNIX, either by truncating or extending it.
38. Which command is used to rename a directory in UNIX?
a) ren
b) rename
c) mv
d) move
Answer: c) mv
Explanation: The mv command is used to rename directories as well as move them in UNIX.
39. What is the purpose of the rm command with the -i option in UNIX?
a) Remove files interactively
b) Remove files forcefully
c) Remove files silently
d) Remove files recursively
Answer: a) Remove files interactively
Explanation: The rm command with the -i option prompts the user before removing each file in UNIX.
40. Which command is used to change the owner and group of a file or directory in UNIX?
a) chown
b) chgrp
c) chmod
d) chowngrp
Answer: a) chown
Explanation: The chown command is used to change the owner and group of a file or directory in UNIX.
41. What is the purpose of the ln command with the -r option in UNIX?
a) Create symbolic links
b) Create hard links
c) Remove links
d) Rename links
Answer: b) Create hard links
Explanation: The ln command with the -r option is used to create hard links in UNIX.
42. Which command is used to display the disk space usage of a file or directory in UNIX?
a) df
b) du
c) usage
d) diskusage
Answer: b) du
Explanation: The du command is used to display the disk space usage of a file or directory in UNIX.
43. What is the purpose of the mv command with the -f option in UNIX?
a) Move files forcibly
b) Move files interactively
c) Move files silently
d) Move files recursively
Answer: a) Move files forcibly
Explanation: The mv command with the -f option is used to move files forcibly, overwriting existing files without confirmation in UNIX.
44. Which command is used to display the size of files and directories in UNIX?
a) size
b) ls -s
c) du
d) filesize
Answer: c) du
Explanation: The du command is used to display the size of files and directories in UNIX.
45. What is the purpose of the touch command with the -r option in UNIX?
a) Change file permissions
b) Change file timestamps to match another file
c) Change file ownership
d) Change file type
Answer: b) Change file timestamps to match another file
Explanation: The touch command with the -r option is used to change the timestamps of a file to match another file in UNIX.
46. Which command is used to display the block size of a file system in UNIX?
a) fsblksize
b) blocksize
c) blksize
d) stat
Answer: d) stat
Explanation: The stat command is used to display detailed information about files and file systems in UNIX, including the block size.
47. What is the purpose of the find command with the -name option in UNIX?
a) Search for files by name
b) Search for files by type
c) Search for files by size
d) Search for files by content
Answer: a) Search for files by name
Explanation: The find command with the -name option is used to search for files in UNIX based on their names.
48. Which command is used to change the permissions of a file or directory in UNIX?
a) chmod
b) chown
c) chgrp
d) perm
Answer: a) chmod
Explanation: The chmod command is used to change the permissions of a file or directory in UNIX.
49. What is the purpose of the ln command with the -s option in UNIX?
a) Create symbolic links
b) Create hard links
c) Remove links
d) Rename links
Answer: a) Create symbolic links
Explanation: The ln command with the -s option is used to create symbolic links in UNIX.
50. Which command is used to display the disk space usage of file systems in UNIX?
a) fsusage
b) dfs
c) df
d) diskusage
Answer: c) df
Explanation: The df command is used to display information about file systems in UNIX, including their disk space usage.
