mlr

Miller is like awk, sed, cut, join, and sort for name-indexed data such as CSV, TSV, and tabular JSON. More information: https://johnkerl.org/miller/doc.

• 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

• Filter lines of a compressed CSV file treating numbers as strings:

mlr --prepipe 'gunzip' --csv filter -S '$fieldName =~ "regular_expression"' example.csv.gz