I want to create bash script that it converts output of other scripts (Normally simple text) in a valid json form. How can I do this ?

Example:

awk '/^Mem/ {printf("%u%%", 100*$3/$2);}' <(free -m)

command give me used memory. I want to get output in valid jason form.

Desired output:

 {“Memory”:”80”}

0

3 Answers

free -k | { read read TITLE TOTAL USED REST echo "{\"Memory\":\"$(( 100 * $USED / $TOTAL ))\"}"
}

The output of free is piped to a compound command consisting of:
A first "read" which skips the first output line of "free".
A second "read" which reads the line we need, we need only the second and third value.
An echo which prints the line in the format you want including the calculation

5

Here's an example for memory:

echo {\"Memory\":\"$(awk '/^Mem/ {printf("%u", 100*$3/$2);}' <(free -m))\"} > mem.json

Putting that new file name into json:

echo {\"file\":\"$(ls mem.json)\"} > filename.json

Or:

echo {\"<paramName-here>\":\"$(<value-of-param-from-command-here>)\"} > mem.json 

When it gets more complicated than this, you can continue to write line by line or more likely build strings in a variable.

I created a tool called jc that converts the output of many command line tools, inclduing free to json:

$ jc free | jq
[ { "type": "Mem", "total": 3993360, "used": 293248, "free": 3185992, "shared": 1196, "buff_cache": 514120, "available": 3465280 }, { "type": "Swap", "total": 2097148, "used": 0, "free": 2097148 }
]

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