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What does the whoami command do in UNIX? a) Displays the current username b) Displays system information c) Shows the current directory d) Lists active processes Answer: a) Displays the current username Explanation: The whoami command in UNIX displays the username of the currently logged-in user. This is useful when working in environments with multiple […]

Which command is used to display the content of a file in reverse order? a) tac b) cat c) head d) tail Answer: a) tac Explanation: The tac command in UNIX is used to display the content of a file in reverse order. It is the reverse of the cat command, which displays file content

What does the fg command do in UNIX? a) Brings a background process to the foreground b) Pauses a process c) Terminates a background process d) Lists active processes Answer: a) Brings a background process to the foreground Explanation: The fg command in UNIX is used to bring a background process to the foreground. When

What does the bg command do in UNIX? a) Moves a process to the background b) Terminates a process c) Pauses a process d) Resumes a paused process in the foreground Answer: a) Moves a process to the background Explanation: The bg command in UNIX is used to move a process to the background. If

What does the history command do in UNIX? a) Displays the list of previously executed commands b) Displays system log files c) Shows the list of active users d) Displays recently modified files Answer: a) Displays the list of previously executed commands Explanation: The history command in UNIX displays a list of previously executed commands.

What is the purpose of the gzip command in UNIX? a) To compress files b) To extract files c) To display file contents d) To list files in a directory Answer: a) To compress files Explanation: The gzip command in UNIX is used to compress files, reducing their size for more efficient storage and transfer.

What does the df command display in UNIX? a) Disk space usage b) File permissions c) Process information d) Network usage Answer: a) Disk space usage Explanation: The df command in UNIX is used to display information about the disk space usage of file systems. It shows the total size, used space, available space, and

Which command is used to extract a .tar.gz archive in UNIX? a) tar -xzf b) tar -cvf c) unzip d) untar Answer: a) tar -xzf Explanation: The tar -xzf command in UNIX is used to extract .tar.gz archives. The -x option specifies extraction, -z specifies gzip compression, and -f specifies the file to be extracted.

What is the function of the ln command in UNIX? a) To create links to files b) To list files in a directory c) To create new directories d) To move files Answer: a) To create links to files Explanation: The ln command in UNIX is used to create hard links or symbolic (soft) links

What is the purpose of the tar command in UNIX? a) To create and manage archive files b) To delete files c) To view file permissions d) To display file contents Answer: a) To create and manage archive files Explanation: The tar command in UNIX is used to create, extract, and manage archive files. It

Which command is used to display a file’s content one page at a time? a) more b) less c) cat d) head Answer: a) more Explanation: The more command in UNIX is used to display the content of a file one screen (or page) at a time. This is particularly useful when viewing large files,

What does the touch command do in UNIX? a) Creates a new, empty file b) Changes file permissions c) Displays file content d) Moves files between directories Answer: a) Creates a new, empty file Explanation: The touch command in UNIX is used to create a new, empty file. When you run touch filename, it creates

Which command in UNIX is used to search for files in a directory hierarchy? a) find b) locate c) grep d) search Answer: a) find Explanation: The find command in UNIX is used to search for files and directories in a directory hierarchy. It allows users to specify various search criteria, such as file name,

Which command is used to kill a process in UNIX? a) kill b) stop c) end d) exit Answer: a) kill Explanation: The kill command is used to terminate a process in UNIX. It works by sending a signal to a process, such as SIGTERM (terminate) or SIGKILL (forcefully terminate). You need to specify the

What is the function of the ps command in UNIX? a) To list the running processes b) To display disk space usage c) To change file permissions d) To delete files Answer: a) To list the running processes Explanation: The ps command in UNIX is used to display information about currently running processes. By default,

What does the df -h command do in UNIX? a) Displays disk space usage in human-readable format b) Displays free memory c) Displays hidden files d) Displays system uptime Answer: a) Displays disk space usage in human-readable format Explanation: The df -h command in UNIX displays disk space usage in a human-readable format, such as

Which command is used to change the group ownership of a file in UNIX? a) chgrp b) chmod c) chown d) grpmod Answer: a) chgrp Explanation: The chgrp command in UNIX is used to change the group ownership of a file or directory. It allows the file’s owner or a system administrator to change the

Which command in UNIX is used to search for a specific pattern in files? a) grep b) find c) locate d) search Answer: a) grep Explanation: The grep command in UNIX is used to search for a specific pattern within files and display the matching lines. It stands for “global regular expression print” and allows

What is the purpose of the cat command in UNIX? a) To concatenate and display the content of files b) To list all files in a directory c) To change file permissions d) To move files between directories Answer: a) To concatenate and display the content of files Explanation: The cat command in UNIX is

What does the pwd command do in UNIX? a) Prints the working directory b) Changes the current directory c) Displays process information d) Prints file contents Answer: a) Prints the working directory Explanation: The pwd command in UNIX stands for “print working directory,” and it displays the absolute path of the current directory. This is

What is the purpose of the chmod command in UNIX? a) To change file permissions b) To change the ownership of a file c) To modify the content of a file d) To delete files Answer: a) To change file permissions Explanation: The chmod command in UNIX is used to change file permissions. File permissions

Which command in UNIX is used to remove an empty directory? a) rmdir b) rm c) deldir d) delete Answer: a) rmdir Explanation: The rmdir command in UNIX is used to remove an empty directory. If the directory contains any files or subdirectories, the command will not delete it, and an error message will be

What does the uptime command show in UNIX? a) The system’s uptime since the last reboot b) CPU usage c) Disk space usage d) List of active users Answer: a) The system’s uptime since the last reboot Explanation: The uptime command in UNIX displays how long the system has been running since its last reboot.

Which UNIX command is used to display the current system time and date? a) time b) date c) clock d) uptime Answer: b) date Explanation: The date command in UNIX displays the current system date and time. When you type date in the terminal, it outputs the current date and time in a standard format.

What does the du command display in UNIX? a) Disk usage of files and directories b) List of open files c) User information d) CPU usage Answer: a) Disk usage of files and directories Explanation: The du (disk usage) command in UNIX is used to estimate the disk space used by files and directories. By