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hadd(1) 		     General Commands Manual			 hadd(1)

SYNOPSIS
     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

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 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 compres-
	    sion

	    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 experimen-
	    tal

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

     TARGET Target file

     SOURCESSource files

									 hadd(1)

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