Issue
I have this log file that I check on a frequent basis and because of the format of it, it's quite easier to read when pretty printed. I'd like to do so in a tail.
2019-07-04T09:53:04-07:00 some.package.placeholder.stderr {"log": "The content", "foo": "bar", "baz": "blah"}
2019-07-04T10:15:37-07:00 some.package.placeholder.stderr {"log": "I'm actually", "foo": "bar", "baz": "blah"}
2019-07-04T10:15:37-07:00 some.package.placeholder.stderr {"log": "Interested on", "foo": "bar", "baz": "blah"}
And I want to do something similar to
tail -f myLogFile | grep [...?...] | jq '.log'
So when tailing I get:
The content
I'm actually
Interested on
Or even:
2019-07-04T09:53:04-07:00 The content
2019-07-04T10:15:37-07:00 I'm actually
2019-07-04T10:15:37-07:00 Interested on
Solution
With GNU grep for -o
:
$ tail file | grep -o '{[^}]*}' | jq -r '.log'
The content
I'm actually
Interested on
With any awk:
$ tail file | awk 'sub(/.*{/,"{")' | jq -r '.log'
The content
I'm actually
Interested on
$ tail file | awk '{d=$1} sub(/.*{/,""){$0="{\"date\": \""d"\", " $0} 1' | jq -r '.date + " " + .log'
2019-07-04T09:53:04-07:00 The content
2019-07-04T10:15:37-07:00 I'm actually
2019-07-04T10:15:37-07:00 Interested on
That last one works by merging the date field from the input into the json so then jq can just select and print it with the log field.
Answered By - Ed Morton Answer Checked By - Terry (WPSolving Volunteer)