Advanced Usage
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## Advanced Usage

Argument are processed in the order they appear on the command line and are translated internally into a pipeline that data flows through when executed. Normally one would:

read from one input
optionally apply filters
write into one output

but GPSBabel is flexible enough to allow more complicated operations such as reading from several files (potentially of different types), applying a filter, reading more data, then writing the merged data to multiple destinations.

The input file type remains unchanged until a new `-i` argument is seen. Files are read in the order they appear. So you could merge three input files into one output file with:

Example 2.3. Merging multiple files into one

`gpsbabel -i geo -f 1.loc -f 2.loc -f 3.loc -o geo -F big.loc`

You can merge files of different types:

Example 2.4. Merging multiple files of differing types.

`gpsbabel -i geo -f 1.loc -i gpx -f 2.gpx -i pcx 3.pcx -o gpsutil -F big.gps`

Example 2.5. Writing the same data in multiple output formats.

You can write the same data in different output formats:

`gpsbabel -i geo -f 1.loc -o gpx -F 1.gpx -o pcx -F 1.wpt`

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