This utility provides functionality similar to disk usage 'du'. It
requires PNFS to be locally mounted. 

Usage:  osg_dc_disk_usage_du <directory> [Optional Arguments]

Required Arguments:
        <directory>             PNFS directory to measure usage.

Optional Arguments:
        -h | --human-readable   Generate human readable output.
        -H | --si               Generate human readable output using 
                                powers of 1000, not 1024.
        -s | --summarize        Display only a total for each argument.
        -a | --all              Write counts for all files, not just 
                                directories.