NAME

       osmium-merge-changes - merge several OSM change files into one

SYNOPSIS

       osmium merge-changes [OPTIONS] OSM-CHANGE-FILE...

DESCRIPTION

       Merges  the  content  of  all change files given on the command line into one large change
       file.  Objects are sorted by type, ID, version, and timestamp so it doesn't matter in what
       order the change files are given or in what order they contain the data.

       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.

OPTIONS

       -s, --simplify
              Only write the last version of any object to the output.  For an object created  in
              one  of  the  change  files  and removed in a later one, the deleted version of the
              object will still appear because it is the latest version.

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-changes 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-changes keeps the contents of all the change files in main memory.  This will
       take roughly 10 times as much memory as the files take on disk in .osm.bz2 format.

EXAMPLES

       Merge all changes in changes directory into all.osc.gz:

              osmium merge-changes -o all.osc.gz changes/*.gz

       Because osmium merge-changes sorts its input, you can also use it to sort  just  a  single
       change file:

              osmium merge-changes unsorted.osc.gz -o sorted.osc.gz

SEE ALSO

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