1hadd(1)                     General Commands Manual                    hadd(1)
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SYNOPSIS

6       usage: hadd [-a A] [-k K] [-T T] [-O O] [-v V] [-j J] [-dbg DBG] [-d D]
7       [-n N]
8                   [-cachesize CACHESIZE]
9                   [-experimental-io-features EXPERIMENTAL_IO_FEATURES] [-f F]
10                   [-fk FK] [-ff FF] [-f0 F0] [-f6 F6]
11                   TARGET SOURCES
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DESCRIPTION

15       This program will add histograms from a list of root  files  and  write
16       them to a target root file.
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18       The target file is newly created and must not exist, or if -f ("force")
19       is given, must not be one of the source files.
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OPTIONS

24       -a     Append to the output
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26       -k     Skip corrupt or non-existent files, do not exit
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28       -T     Do not merge Trees
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30       -O     Re-optimize basket size when merging TTree
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32       -v     Explicitly set the verbosity level: 0 request no output,  99  is
33              the default
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35       -j     Parallelize the execution in multiple processes
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37       -dbg   Parallelize  the  execution  in multiple processes in debug mode
38              (Does not delete partial files stored inside working directory)
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40       -d     Carry out the partial multiprocess execution  in  the  specified
41              directory
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43       -n     Open  at  most 'maxopenedfiles' at once (use 0 to request to use
44              the system maximum)
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46       -cachesize
47              Resize the prefetching cache use to speed up I/O  operations(use
48              0 to disable)
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50       -experimental-io-features
51              Used with an argument provided, enables the corresponding exper‐
52              imental feature for output trees
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54       -f     Gives the ability to specify the compression level of the target
55              file(by default 4)
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57       -fk    Sets  the  target file to contain the baskets with the same com‐
58              pression
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60              as the input files (unless -O is specified). Compresses the meta
61              data
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63              using the compression level specified in the first input or the
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65              compression setting after fk (for example 206 when using -fk206)
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67       -ff    The  compression  level  use  is  the one specified in the first
68              input
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70       -f0    Do not compress the target file
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72       -f6    Use compression level 6. (See TFile::SetCompressionSettings  for
73              the support range of value.)
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75       TARGET Target file
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77       SOURCES
78              Source files
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82                                                                       hadd(1)
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