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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.

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This has the same effect as the previous example. The filename name /glast/admin/mon_all.tst will automatically resolve to root://glast-rdr//glast/admin/mon_all.tst

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