将 bash output 转换为 JSON

Question

I am running the following command:

sudo clustat | grep primary | awk 'NF{print $1",""server:"$2 ",""status:"$3}'

Results are:

service:servicename,server:servername,status:started
service:servicename,server:servername,status:started
service:servicename,server:servername,status:started
service:servicename,server:servername,status:started
service:servicename,server:servername,status:started

My desired result is:

{"service":"servicename","server":"servername","status":"started"}
{"service":"servicename","server":"servername","status":"started"}
{"service":"servicename","server":"servername","status":"started"}
{"service":"servicename","server":"servername","status":"started"}
{"service":"servicename","server":"servername","status":"started"}

I can't seem to put the qoutation marks withour srewing up my output.

Answer 1

Use jq :

sudo clustat | grep primary |
  jq -R 'split(" ")|{service:.[0], server:.[1], status:.[2]}'

The input is read as raw text, not JSON. Each line is split on a space (the argument to split may need to be adjusted depending on the actual input). jq ensures that values are properly quoted when constructing the output objects.

Answer 2

Don't do this: Instead, use @chepner's answer , which is guaranteed to generate valid JSON as output with all possible inputs (or fail with a nonzero exit status if no JSON representation is possible).

The below is only tested to generate valid JSON with the specific inputs shown in the question, and will quite certainly generate output that is not valid JSON with numerous possible inputs (strings with literal quotes, strings ending in literal backslashes, etc).

sudo clustat |
  awk '/primary/ {
         print "{\"service\":\"" $1 "\",\"server\":\"" $2 "\",\"status\":\""$3"\"}"
       }' 

Answer 3

For JSON conversion of common shell commands, a good option is jc (JSON Convert)

There is no parser for clustat yet though.