how transform stdin input to some json field in list of lines using jq

Question

I need a utility that

read from stdin, split as lines
write to stdout json object, {"cmd": "In", "lines": [lines from stdin]}

I heard jq being quite powerful, how to acheive above with jq or similar tools.

pmf · Accepted Answer · 2023-01-21 21:34:19Z

6

By default, jq reads from stdin. The -R flag lets you read raw input streamed linewise. Using [inputs] in combination with the -n flag lets you collect the lines into an array.

… | jq -Rn '{cmd: "In", lines: [inputs]}'

answered Jan 21, 2023 at 21:34

pmf

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3 Comments

qeatzy Over a year ago

I need output to be one line. Found -c in jq --help. By the way, does jq support write to a socket, eg, 127.0.0.1:8080.

pmf Over a year ago

@qeatzy The -c compacts the output to one line, the -j flag gets rid of trailing newlines. Support for I/O is minimal in general, and currently only supports reading from stdin, and writing to stdout and stderr.

chepner Over a year ago

jq itself doesn't write to a socket, but whatever calls jq can arrange for its standard output to be the socket you want to write to.

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