.TH "OSMIUM-MERGE-CHANGES" "1" "1.5.1" "" ""
.SH NAME
.PP
osmium\-merge\-changes \- merge several OSM change files into one
.SH SYNOPSIS
.PP
\f[B]osmium merge\-changes\f[] [\f[I]OPTIONS\f[]]
\f[I]OSM\-CHANGE\-FILE\f[]...
.SH DESCRIPTION
.PP
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\[aq]t
matter in what order the change files are given or in what order they
contain the data.
.SH OPTIONS
.TP
.B \-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.
.RS
.RE
.SH COMMON OPTIONS
.TP
.B \-h, \-\-help
Show usage help.
.RS
.RE
.TP
.B \-v, \-\-verbose
Set verbose mode.
The program will output information about what it is doing to
\f[I]stderr\f[].
.RS
.RE
.SH INPUT OPTIONS
.TP
.B \-F, \-\-input\-format=FORMAT
The format of the input file(s).
Can be used to set the input format if it can\[aq]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 \f[B]osmium\-file\-formats\f[](5) or the libosmium manual for
details.
.RS
.RE
.SH OUTPUT OPTIONS
.TP
.B \-f, \-\-output\-format=FORMAT
The format of the output file.
Can be used to set the output file format if it can\[aq]t be
autodetected from the output file name.
See \f[B]osmium\-file\-formats\f[](5) or the libosmium manual for
details.
.RS
.RE
.TP
.B \-\-fsync
Call fsync after writing the output file to force flushing buffers to
disk.
.RS
.RE
.TP
.B \-\-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 "\f[I]osmium/\f[]" and the version of osmium.
.RS
.RE
.TP
.B \-o, \-\-output=FILE
Name of the output file.
Default is \[aq]\-\[aq] (STDOUT).
.RS
.RE
.TP
.B \-O, \-\-overwrite
Allow an existing output file to be overwritten.
Normally \f[B]osmium\f[] will refuse to write over an existing file.
.RS
.RE
.TP
.B \-\-output\-header=OPTION
Add output header option.
This option can be given several times.
See the \f[I]libosmium manual\f[] for a list of allowed header options.
.RS
.RE
.SH DIAGNOSTICS
.PP
\f[B]osmium merge\-changes\f[] exits with exit code
.TP
.B 0
if everything went alright,
.RS
.RE
.TP
.B 1
if there was an error processing the data, or
.RS
.RE
.TP
.B 2
if there was a problem with the command line arguments.
.RS
.RE
.SH MEMORY USAGE
.PP
\f[B]osmium merge\-changes\f[] 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 \f[I]\&.osm.bz2\f[] format.
.SH EXAMPLES
.PP
Merge all changes in \f[I]changes\f[] directory into
\f[I]all.osc.gz\f[]:
.IP
.nf
\f[C]
osmium\ merge\-changes\ \-o\ all.osc.gz\ changes/*.gz
\f[]
.fi
.PP
Because \f[C]osmium\ merge\-changes\f[] sorts its input, you can also
use it to sort just a single change file:
.IP
.nf
\f[C]
osmium\ merge\-changes\ unsorted.osc.gz\ \-o\ sorted.osc.gz
\f[]
.fi
.SH SEE ALSO
.IP \[bu] 2
\f[B]osmium\f[](1), \f[B]osmium\-file\-formats\f[](5),
\f[B]osmium\-merge\f[](1)
.IP \[bu] 2
Osmium website (http://osmcode.org/osmium-tool/)
.SH COPYRIGHT
.PP
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.
.SH CONTACT
.PP
If you have any questions or want to report a bug, please go to
http://osmcode.org/contact.html
.SH AUTHORS
Jochen Topf <jochen@topf.org>.