200-901 Question #93: Real Exam Question with Answer & Explanation

Question

Drag and Drop Question Drag and Drop the Bash commands from the left onto the correct actions on the right. Answer:

Explanation

This question assesses the test-taker's fundamental knowledge of common Linux Bash shell commands for file system navigation, file and directory manipulation, and environment variable management.

Approach. The test-taker must drag each Bash command from the left-hand side to its correct action/description on the right-hand side. The correct pairings are as follows:

• Drag 'cd~' to 'change directory to user $HOME'. The tilde (~) is a shortcut for the current user's home directory.
• Drag 'cd/' to 'change directory to file system root'. The forward slash (/) represents the root directory of the file system.
• Drag 'ls -l' to 'list files in directory with details'. The '-l' option provides a long listing format, showing detailed information.
• Drag 'ls -t' to 'list files in directory sorted by edited date descending'. The '-t' option sorts by modification time, newest first.
• Drag 'cp' to 'copy file'. This is the basic command to copy files.
• Drag 'cp -r' to 'copy directory'. The '-r' or '--recursive' option is required to copy directories and their contents.
• Drag 'mv' to 'move file'. This command is used to move or rename files and directories.
• Drag 'touch' to 'create file'. The 'touch' command is primarily used to change file timestamps, but it also creates an empty file if it doesn't exist.
• Drag 'mkdir' to 'create directory'. This command is used to make new directories.
• Drag 'export' to 'create environment variable'. The 'export' command sets an environment variable to be available to child processes.

Common mistakes.

• common_mistake. A common mistake would be confusing commands with similar functionality or options. For example:
• Dragging 'ls -l' to 'list files in directory sorted by edited date descending' (which is for 'ls -t') or vice versa. '-l' provides details, while '-t' sorts by time.
• Dragging 'cp' to 'copy directory' (which requires 'cp -r'). The base 'cp' command is for files, not directories.
• Dragging 'touch' to 'create directory' (which is for 'mkdir'). 'touch' creates files, 'mkdir' creates directories.
• Incorrectly associating 'export' with file operations rather than environment variables, as 'export' is distinct from file/directory commands.

Concept tested. Core Linux/Unix Bash shell commands for file system navigation, file and directory management, and environment variable manipulation.

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