How can you find the size of a directory in Linux?

To find the size of a directory in Linux, using the "du" (disk usage) command is the most effective approach. The option "du -sh directoryname" combines two important flags: "s" stands for "summarize," which means it will report the total size of the specified directory without listing the sizes of individual files within that directory. The "h" flag stands for "human-readable," which means the output will be in a format that is easier to understand (e.g., displaying sizes in KB, MB, etc., rather than just bytes).

When you run this command, it efficiently calculates the total size of all files and subdirectories contained within the specified directory, providing a quick and clear overview of its disk usage.

On the other hand, the other choices do not achieve the same result. The "dir" command is more commonly used for listing directory contents on MS-DOS systems and is not typically used for size calculations in Linux. The "size" command does not exist for obtaining directory sizes and would not work as intended. The "ls -lh" command is used to list files in a directory with human-readable sizes, but it does not aggregate the sizes of all files to give a total directory size