.TH hadd 1 
.SH 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

.SH 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.
.SH OPTIONS
.IP -a
Append to the output
.IP -k
Skip corrupt or non-existent files, do not exit
.IP -T
Do not merge Trees
.IP -O
Re-optimize basket size when merging TTree
.IP -v
Explicitly set the verbosity level: 0 request no output, 99 is the
.IP
default
.IP -j
Parallelize the execution in multiple processes
.IP -dbg
Parallelize the execution in multiple processes in debug mode (Does
.IP
not delete partial files stored inside working directory)
.IP -d
Carry out the partial multiprocess execution in the specified
.IP
directory
.IP -n
Open at most 'maxopenedfiles' at once (use 0 to request to use the
.IP
system maximum)
.IP -cachesize
Resize the prefetching cache use to speed up I/O operations(use 0 to
.IP
disable)
.IP -experimental-io-features
Used with an argument provided, enables the corresponding experimental
.IP
feature for output trees
.IP -f
Force overwriting of output file.
.IP -f[0-9]
Gives the ability to specify the compression level of the target file
.IP
(by default 4)
.IP -fk
Sets the target file to contain the baskets with the same compression
.IP
as the input files (unless -O is specified). Compresses the meta data
.IP
using the compression level specified in the first input or the
.IP
compression setting after fk (for example 206 when using -fk206)
.IP -ff
The compression level use is the one specified in the first input
.IP -f0
Do not compress the target file
.IP -f6
Use compression level 6 (see TFile::SetCompressionSettings for the
.IP
supported range of values)
.IP TARGET
Target file
.IP SOURCES
Source files