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                   [-f[0-9] F[0_9]] [-fk FK] [-ff FF] [-f0 F0] [-f6 F6]
11                   TARGET SOURCES
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DESCRIPTION

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

21       -a     Append to the output
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23       -k     Skip corrupt or non-existent files, do not exit
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25       -T     Do not merge Trees
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27       -O     Re-optimize basket size when merging TTree
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29       -v     Explicitly  set  the verbosity level: 0 request no output, 99 is
30              the
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32              default
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34       -j     Parallelize the execution in multiple processes
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36       -dbg   Parallelize the execution in multiple processes  in  debug  mode
37              (Does
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39              not delete partial files stored inside working directory)
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41       -d     Carry out the partial multiprocess execution in the specified
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43              directory
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45       -n     Open  at  most 'maxopenedfiles' at once (use 0 to request to use
46              the
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48              system maximum)
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50       -cachesize
51              Resize the prefetching cache use to speed up I/O  operations(use
52              0 to
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54              disable)
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56       -experimental-io-features
57              Used with an argument provided, enables the corresponding exper‐
58              imental
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60              feature for output trees
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62       -f     Force overwriting of output file.
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64       -f[0-9]
65              Gives the ability to specify the compression level of the target
66              file
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68              (by default 4)
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70       -fk    Sets  the  target file to contain the baskets with the same com‐
71              pression
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73              as the input files (unless -O is specified). Compresses the meta
74              data
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76              using the compression level specified in the first input or the
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78              compression setting after fk (for example 206 when using -fk206)
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80       -ff    The  compression level use is the one specified in the first in‐
81              put
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83       -f0    Do not compress the target file
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85       -f6    Use compression level 6 (see  TFile::SetCompressionSettings  for
86              the
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88              supported range of values)
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90       TARGET Target file
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92       SOURCES
93              Source files
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97                                                                       hadd(1)
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