hadd - Man Page
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 specify the
full compresion algorithm, e.g. -f206
- -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
- -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