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.. _merge_mapping_files:
.. index:: merge_mapping_files.py
*merge_mapping_files.py* -- Merge mapping files
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**Description:**
This script provides a convenient interface for merging mapping files which contains data on different samples.
**Usage:** :file:`merge_mapping_files.py [options]`
**Input Arguments:**
.. note::
**[REQUIRED]**
-m, `-`-mapping_fps
The input mapping files in a comma-separated list
-o, `-`-output_fp
The output mapping file to write
**[OPTIONAL]**
-n, `-`-no_data_value
Value to represent missing data (i.e., when all fields are not defined in all mapping files) [default: no_data]
**Output:**
The result of this script is a merged mapping file (tab-delimited).
**Example:**
Merge two mapping files into a new mapping file (merged_mapping.txt). In cases where a mapping field is not provided for some samples, add the value 'Data not collected'.
::
merge_mapping_files.py -m map_controls.txt,map_fasting.txt -o merged_mapping.txt -n 'Data not collected'
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