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Hi,
 implementing xrootd checksums for DPM I found a few issues with xrdfs:

- there is no way to specify the wanted checksum type, e.g. adler32 or md5
- the result is weird/broken, e.g.:

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$ xrdfs dpmhead-trunk.cern.ch query checksum /dpm/cern.ch/home/dteam/fabtest/ouch1
adler32 6338386537306436
-------------

... instead if I use the older 'xrd' command line I can specify which checksum is needed, moreover the result is correct:
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$ getchecksum /dpm/cern.ch/home/dteam/fabtest/ouch1 md5
md5: 64fd36ae477e970b06949fe90d0c8c20
$ getchecksum /dpm/cern.ch/home/dteam/fabtest/ouch1 adler32
adler32: c88e70d6
-------------

I believe that 'xrdfs' needs fixing. This issue also affects the gfal-sum/gfal-copy client commands



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