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tldr/pages/common/mlr.md
2018-10-16 18:26:42 +01:00

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mlr

Miller is like awk, sed, cut, join, and sort for name-indexed data such as CSV, TSV, and tabular JSON.

  • Pretty-print a CSV file in a tabular format:

mlr --icsv --opprint cat {{example.csv}}

  • Receive JSON data and pretty print the output:

echo '{"hello":"world"}' | mlr --ijson --opprint cat

  • Sort alphabetically on a field:

mlr --icsv --opprint sort -f {{field}} {{example.csv}}

  • Sort in descending numerical order on a field:

mlr --icsv --opprint sort -nr {{field}} {{example.csv}}

  • Convert CSV to JSON, performing calculations and display those calculations:

mlr --icsv --ojson put '${{newField1}} = ${{oldFieldA}}/${{oldFieldB}}' {{example.csv}}

  • Receive JSON and format the output as vertical JSON:

echo '{"hello":"world", "foo":"bar"}' | mlr --ijson --ojson --jvstack cat