.TH "OSMIUM-MERGE" "1" "1.15.0" "" ""
.SH NAME
.PP
osmium-merge - merge several sorted OSM files into one
.SH SYNOPSIS
.PP
\f[B]osmium merge\f[R] [\f[I]OPTIONS\f[R]] \f[I]OSM-FILE\f[R]\&...
.SH DESCRIPTION
.PP
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.
.PP
If there is only a single input file, its contents will be copied to the
output.
.PP
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.
.PP
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\[cq]t make any promises on what the result of the command
is if the input data is not correct.
.PP
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.
.SH OPTIONS
.TP
-H, --with-history
Do not warn when there are multiple versions of the same object in the
input files.
.SH COMMON OPTIONS
.TP
-h, --help
Show usage help.
.TP
-v, --verbose
Set verbose mode.
The program will output information about what it is doing to STDERR.
.TP
--progress
Show progress bar.
Usually a progress bar is only displayed if STDOUT and STDERR are
detected to be TTY.
With this option a progress bar is always shown.
Note that a progress bar will never be shown when reading from STDIN or
a pipe.
.TP
--no-progress
Do not show progress bar.
Usually a progress bar is displayed if STDOUT and STDERR are detected to
be a TTY.
With this option the progress bar is suppressed.
Note that a progress bar will never be shown when reading from STDIN or
a pipe.
.SH INPUT OPTIONS
.TP
-F, --input-format=FORMAT
The format of the input file(s).
Can be used to set the input format if it can\[cq]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[R](5) or the libosmium manual for
details.
.SH OUTPUT OPTIONS
.TP
-f, --output-format=FORMAT
The format of the output file.
Can be used to set the output file format if it can\[cq]t be
autodetected from the output file name.
See \f[B]osmium-file-formats\f[R](5) or the libosmium manual for
details.
.TP
--fsync
Call fsync after writing the output file to force flushing buffers to
disk.
.TP
--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 \[lq]\f[I]osmium/\f[R]\[rq] and the version of osmium.
.TP
-o, --output=FILE
Name of the output file.
Default is `-' (STDOUT).
.TP
-O, --overwrite
Allow an existing output file to be overwritten.
Normally \f[B]osmium\f[R] will refuse to write over an existing file.
.TP
--output-header=OPTION=VALUE
Add output header option.
This command line option can be used multiple times for different
OPTIONs.
See the \f[I]osmium-output-headers(5)\f[R] man page for a list of
available header options.
For some commands you can use the special format \[lq]OPTION!\[rq] (ie.
an exclamation mark after the OPTION and no value set) to set the value
to the same as in the input file.
.SH DIAGNOSTICS
.PP
\f[B]osmium merge\f[R] exits with exit code
.TP
0
if everything went alright,
.TP
1
if there was an error processing the data, or
.TP
2
if there was a problem with the command line arguments.
.SH MEMORY USAGE
.PP
\f[B]osmium merge\f[R] doesn\[cq]t keep a lot of data in memory, but if
you are merging many files, the buffers might take a noticeable amount
of memory.
.SH EXAMPLES
.PP
Merge several extracts into one:
.IP
.nf
\f[C]
osmium merge washington.pbf oregon.pbf california.pbf -o westcoast.pbf
\f[R]
.fi
.SH SEE ALSO
.IP \[bu] 2
\f[B]osmium\f[R](1), \f[B]osmium-file-formats\f[R](5),
\f[B]osmium-output-headers\f[R](5), \f[B]osmium-merge-changes\f[R](1)
.IP \[bu] 2
Osmium website (https://osmcode.org/osmium-tool/)
.SH COPYRIGHT
.PP
Copyright (C) 2013\-2023 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
https://osmcode.org/contact.html
.SH AUTHORS
Jochen Topf <jochen@topf.org>.