hadd - Man Page

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

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.

-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