Update cheatsheets

csvgrep

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# csvgrep
+
+> Filter CSV rows with string and pattern matching.
+> Included in csvkit.
+> More information: <https://csvkit.readthedocs.io/en/latest/scripts/csvgrep.html>.
+
+- Find rows that have a certain string in column 1:
+
+`csvgrep -c {{1}} -m {{string_to_match}} {{data.csv}}`
+
+- Find rows in which columns 3 or 4 match a certain regular expression:
+
+`csvgrep -c {{3,4}} -r {{regular_expression}} {{data.csv}}`
+
+- Find rows in which the "name" column does NOT include the string "John Doe":
+
+`csvgrep -i -c {{name}} -m "{{John Doe}}" {{data.csv}}`