hadd(1)                     General Commands Manual                    hadd(1)

SYNOPSIS
       usage: hadd [-a A] [-k K] [-T T] [-O O] [-v V] [-j J] [-dbg DBG] [-d D]
       [-n N]
                   [-cachesize CACHESIZE]
                   [-experimental-io-features EXPERIMENTAL_IO_FEATURES] [-f F]
                   [-f[0-9] F[0_9]] [-fk FK] [-ff FF] [-f0 F0] [-f6 F6]
                   TARGET SOURCES


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

OPTIONS
       -a     Append to the output

       -k     Skip corrupt or non-existent files, do not exit

       -T     Do not merge Trees

       -O     Re-optimize basket size when merging TTree

       -v     Explicitly set the verbosity level: 0 request no output, 99 is
              the

              default

       -j     Parallelize the execution in multiple processes

       -dbg   Parallelize the execution in multiple processes in debug mode
              (Does

              not delete partial files stored inside working directory)

       -d     Carry out the partial multiprocess execution in the specified

              directory

       -n     Open at most 'maxopenedfiles' at once (use 0 to request to use
              the

              system maximum)

       -cachesize
              Resize the prefetching cache use to speed up I/O operations(use
              0 to

              disable)

       -experimental-io-features
              Used with an argument provided, enables the corresponding
              experimental

              feature for output trees

       -f     Force overwriting of output file.

       -f[0-9]
              Gives the ability to specify the compression level of the target
              file

              (by default 4)

       -fk    Sets the target file to contain the baskets with the same
              compression

              as the input files (unless -O is specified). Compresses the meta
              data

              using the compression level specified in the first input or the

              compression setting after fk (for example 206 when using -fk206)

       -ff    The compression level use is the one specified in the first
              input

       -f0    Do not compress the target file

       -f6    Use compression level 6 (see TFile::SetCompressionSettings for
              the

              supported range of values)

       TARGET Target file

       SOURCES
              Source files

                                                                       hadd(1)