Which flag provides a more detailed summary when using the free command?

The choice that provides a more detailed summary when using the free command is indicated by the combination of the flags -lohi. This combination specifies that you want a more comprehensive output related to system memory.

When used, the flag -l gives a more detailed list of memory usage, displaying totals of both physical and swap memory and providing additional context compared to the default output. The -o flag enhances the output by including the amount of memory allocated for buffers and cache, which is vital for understanding how much memory is actually available for applications. The -h flag makes the output human-readable by converting the numerical values into more understandable formats (like KB, MB, or GB). Lastly, the -i flag can add information about the status of memory even further.

Combining all these flags into -lohi provides a robust summary that greatly aids in analyzing memory usage in a Linux environment, making it far more informative than standard usage of the free command without these additional capabilities.