Update cheatsheets

csvstat

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# csvstat
+
+> Print descriptive statistics for all columns in a CSV file.
+> Included in csvkit.
+> More information: <https://csvkit.readthedocs.io/en/latest/scripts/csvstat.html>.
+
+- Show all stats for all columns:
+
+`csvstat {{data.csv}}`
+
+- Show all stats for columns 2 and 4:
+
+`csvstat -c {{2,4}} {{data.csv}}`
+
+- Show sums for all columns:
+
+`csvstat --sum {{data.csv}}`
+
+- Show the max value length for column 3:
+
+`csvstat -c {{3}} --len {{data.csv}}`
+
+- Show the number of unique values in the "name" column:
+
+`csvstat -c {{name}} --unique {{data.csv}}`