NAME

       osmium-merge - merge several sorted OSM files into one

SYNOPSIS

       osmium merge [OPTIONS] OSM-FILE...

DESCRIPTION

       Merges  the  content  of  all OSM files given on the command line into one large OSM file.
       Objects in all files must be sorted by type, ID, and version.  The results  will  also  be
       sorted  in  the same way.  Objects that appear in multiple input files will only be in the
       output once.

       If there is only a single input file, its contents will be copied to the output.

       If there are different versions of the same object in the input files, all  versions  will
       appear in the output.  So this command will work fine with history files as input creating
       a new history file.  Do not use this command to merge non-history  files  with  data  from
       different points in time.  It will not work correctly.

       If  you  have  objects  with  the same type, id, and version but different other data, the
       result of this command is undefined.  This situation  can  never  happen  in  correct  OSM
       files,  but sometimes buggy programs can generate data like this.  Osmium doesn't make any
       promises on what the result of the command is if the input data is not correct.

       This commands reads its input file(s) only once and writes its output file in one go so it
       can be streamed, ie.  it can read from STDIN and write to STDOUT.

COMMON OPTIONS

       -h, --help
              Show usage help.

       -v, --verbose
              Set  verbose  mode.   The program will output information about what it is doing to
              STDERR.

INPUT OPTIONS

       -F, --input-format=FORMAT
              The format of the input file(s).  Can be used to set the input format if  it  can't
              be  autodetected  from  the  file  name(s).  This will set the format for all input
              files, there is no  way  to  set  the  format  for  some  input  files  only.   See
              osmium-file-formats(5) or the libosmium manual for details.

OUTPUT OPTIONS

       -f, --output-format=FORMAT
              The  format  of  the  output file.  Can be used to set the output file format if it
              can't be autodetected from the output file name.  See osmium-file-formats(5) or the
              libosmium manual for details.

       --fsync
              Call fsync after writing the output file to force flushing buffers to disk.

       --generator=NAME
              The  name  and version of the program generating the output file.  It will be added
              to the header of the output file.  Default is "osmium/" and the version of osmium.

       -o, --output=FILE
              Name of the output file.  Default is '-' (STDOUT).

       -O, --overwrite
              Allow an existing output file to be overwritten.  Normally osmium  will  refuse  to
              write over an existing file.

       --output-header=OPTION
              Add  output  header  option.   This  option  can  be  given several times.  See the
              libosmium manual for a list of allowed header options.

DIAGNOSTICS

       osmium merge exits with exit code

       0      if everything went alright,

       1      if there was an error processing the data, or

       2      if there was a problem with the command line arguments.

MEMORY USAGE

       osmium merge doesn't keep a lot of data in memory, but if you are merging many files,  the
       buffers might take a noticeable amount of memory.

EXAMPLES

       Merge several extracts into one:

              osmium merge washington.pbf oregon.pbf california.pbf -o westcoast.pbf

SEE ALSO

       • osmium(1), osmium-file-formats(5), osmium-merge-changes(1)

       • Osmium website (http://osmcode.org/osmium-tool/)

COPYRIGHT

       Copyright (C) 2013-2017 Jochen Topf <jochen@topf.org>.

       License  GPLv3+:  GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.  This is
       free software: you are free to change and redistribute it.  There is NO WARRANTY,  to  the
       extent permitted by law.

CONTACT

       If    you   have   any   questions   or   want   to   report   a   bug,   please   go   to
       http://osmcode.org/contact.html

AUTHORS

       Jochen Topf <jochen@topf.org>.

                                              1.7.1                               OSMIUM-MERGE(1)