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The script xrdprel should be used to run a command using the xrootd preload library. The script sets the proper environment variables (LD_LIBRARY_PATH, LD_PRELOAD) and then executes the provided command. The LD_PRELOAD variable instructs the loader to load an additional library in this case the xrootd preload library. Certain function calls (e.g.: open, close, read, fopen, fclose, fread, ...) are called from the preload library which if
a file is a xrootd file will subsequently use the xrootd tools to access the file. If a file is not and xrootd file the call will be redirected to the corresponding system call.

The usage is:

xrdprel [-g] [-h]  _command_ _args_

_command_ and _args_ are the user command and and its arguments

-h: prints a help 
-g: use a virtual mountpoint, which means file names starting with /glast/ are assumed to be 
    xrootd files.  

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/afs/slac.stanford.edu/g/glast/applications/xrootd/<REL>PROD/bin

where <REL> is either PROD, DEV or TEST. Currently DEV and TEST have the most functional preload library.

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Examples:

ls a file:

xrdprel ls -l

Would run ls against a file in xrootd.

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