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hadd(1)			    General Commands Manual		       hadd(1)

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

       -f     Force overwriting	of output file

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

	      Default is 1 (kDefaultZLIB), 0 is	uncompressed, 9	is maximum

	      compression (see TFile::TFile documentation). You	can also spec-
	      ify the

	      full compresion algorithm, e.g. -f206

       -fk    Sets the target file to contain the baskets with the  same  com-
	      pression

	      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 in-
	      put

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

       -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 sys-
	      tem

	      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	exper-
	      imental

	      feature for output trees.	See ROOT::Experimental::EIOFeatures

       TARGET Target file

       SOURCES
	      Source files

								       hadd(1)

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