hadd1

Usage

usage: hadd [-a] [-f] [-f [0-9]] [-fk] [-ff] [-k] [-L] [-Ltype] [-O] [-T] [-v V] [-j J] [-dbg] [-d D] [-n N] [-cachesize CACHESIZE] [-experimental-io-features EXPERIMENTAL_IO_FEATURES]

TARGET SOURCES

Overview

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

-f: Force overwriting of output file

-f[0-9]: Gives the ability to specify the compression algorithm i and level j

	of the target file, by passing the number i*100 + j, e.g. -f505. The
	last digit (j) can be set from 0 = uncompressed to 9 = highly
	compressed. The first digit (i) is 1 for ZLIB, 2 for LZMA, 4 for LZ4
	and 5 for ZSTD. Recommended numbers are 101 (ZLIB), 207 (LZMA), 404
	(LZ4), 505 (ZSTD). The default value for this flag is 101
	(kDefaultZLIB). See ROOT::RCompressionSetting and TFile::TFile
	documentation for more details.

-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

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

-L: Read the list of objects from FILE and either only merge or skip those

	objects depending on the value of "-Ltype". FILE must contain one
	object name per line, which cannot contain whitespaces or '/'. You can
	also pass TDirectory names, which apply to the entire directory
	content. Lines beginning with '#' are ignored. If this flag is passed,
	"-Ltype" MUST be passed as well.

-Ltype: Sets the type of operation performed on the objects listed in FILE

	given with the "-L" flag. "SkipListed" will skip all the listed
	objects; "OnlyListed" will only merge those objects. If this flag is
	passed, "-L" must be passed as well.

-O: Re-optimize basket size when merging TTree

-T: Do not merge Trees

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

: default

-j: Parallelize the execution in 'J' processes. If the number of processes

: is not specified, use the system maximum.

-dbg: Enable verbosity. If -j was specified, do not not delete partial files

: stored inside working directory.

-d: Carry out the partial multiprocess execution in the specified

: directory

-n: Open at most 'N' files 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. See ROOT::Experimental::EIOFeatures
`TARGET`	Target file
`SOURCES`	Source files

Releases

4 releases since Debian 5.0 (Lenny); the text changed 2 times.

-L since Arch Linux 2026-11-01; -Ltype since Arch Linux 2026-11-01; -O since Arch Linux 2026-11-01; -T since Arch Linux 2026-11-01; -a since Arch Linux 2026-11-01; -cachesize since Arch Linux 2026-11-01; -d since Arch Linux 2026-11-01; -dbg since Arch Linux 2026-11-01; -experimental-io-features since Arch Linux 2026-11-01; -f since Arch Linux 2026-11-01; -ff since Arch Linux 2026-11-01; -fk since Arch Linux 2026-11-01; -j since Arch Linux 2026-11-01; -k since Arch Linux 2026-11-01; -n since Arch Linux 2026-11-01; -v since Arch Linux 2026-11-01.