Which command is effective for finding users or applications that are consuming the most disk space?

The command that is effective for finding users or applications that are consuming the most disk space is 'du', which stands for disk usage. This command calculates and displays the disk space used by files and directories within a specified directory or throughout the filesystem. When run with the appropriate options, 'du' provides a summary of disk usage and can help identify which files or directories are taking up significant amount of space.

For example, using 'du -h' will display the sizes in a human-readable format, making it easier to analyze the data. Additionally, by using options like 'du -a' you can see the sizes for all files and directories, which is helpful for pinpointing large users or applications. This makes 'du' the most suitable choice for assessing disk usage, and thus, users can manage disk space more effectively.