Update cheatsheets

recsel

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# recsel
+
+> Print records from a recfile: a human-editable, plain text database.
+> More information: <https://www.gnu.org/software/recutils/manual/recutils.html>.
+
+- Extract name and version field:
+
+`recsel -p name,version {{data.rec}}`
+
+- Use "~" to match a string with a given regular expression:
+
+`recsel -e "{{field_name}} ~ '{{regular_expression}}' {{data.rec}}"`
+
+- Use a predicate to match a name and a version:
+
+`recsel -e "name ~ '{{regular_expression}}' && version ~ '{{regular_expression}}'" {{data.rec}}`