Update cheatsheets

jello

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# jello
+
+> A command-line JSON processor using Python syntax.
+> More information: <https://github.com/kellyjonbrazil/jello>.
+
+- Pretty-print JSON or JSON-Lines data from `stdin` to `stdout`:
+
+`cat {{file.json}} | jello`
+
+- Output a schema of JSON or JSON Lines data from `stdin` to `stdout` (useful for grep):
+
+`cat {{file.json}} | jello -s`
+
+- Output all elements from arrays (or all the values from objects) in JSON or JSON-Lines data from `stdin` to `stdout`:
+
+`cat {{file.json}} | jello -l`
+
+- Output the first element in JSON or JSON-Lines data from `stdin` to `stdout`:
+
+`cat {{file.json}} | jello _[0]`
+
+- Output the value of a given key of each element in JSON or JSON-Lines data from `stdin` to `stdout`:
+
+`cat {{file.json}} | jello '[i.{{key_name}} for i in _]'`
+
+- Output the value of multiple keys as a new JSON object (assuming the input JSON has the keys `key_name1` and `key_name2`):
+
+`cat {{file.json}} | jello '{"{{key1}}": _.{{key_name1}}, "{{key_name}}": _.{{key_name2}}}'`
+
+- Output the value of a given key to a string (and disable JSON output):
+
+`cat {{file.json}} | jello -r '"{{some text}}: " + _.{{key_name}}'`