Update cheatsheets

mlr

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# 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}}`