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Top Forums Shell Programming and Scripting Fun with terminal plotting JSON data at the command line Post 303043053 by kbrazil on Thursday 16th of January 2020 12:33:22 PM
Old 01-16-2020
Fun with terminal plotting JSON data at the command line

One of the great thing about unix is the ability to pipe multiple programs together to manipulate data. Plain, unstructured text is the most common type of data that is passed between programs, but these days JSON is becoming more popular.

I thought it would be fun to pipe together some command line JSON tools to do some stupid terminal tricks, like plotting a graph of system statistics, like CPU or memory utilization.

We can use jc (disclosure: I wrote jc), jq, and jp to pull the output of uptime and display a line graph like this:

Image

In this post I'll show you how you can build a quick bar graph of the CPU utilization of the top processes right in the terminal. For more information on how to create the animated line graph above, see my blog post at blog.kellybrazil.com.

first, get jc, jq, and jp.

Then you can use this one-liner to graph the output of ps:
Code:
ps axu | jc --ps | jq '[.[] | select (.cpu_percent > 0.5)]' | jp -type bar -canvas full-escape -x ..pid -y ..cpu_percent

Image

Fun stuff! jq is an awesome JSON tool for the cli and is a bit like sed or awk for JSON. You'll find lots of uses for manipulating JSON as more and more programs start to output in the format.

Last edited by kbrazil; 01-16-2020 at 04:39 PM..
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Jifty::JSON(3pm)					User Contributed Perl Documentation					  Jifty::JSON(3pm)

NAME
Jifty::JSON -- Wrapper around JSON SYNOPSIS
use Jifty::JSON qw/decode_json encode_json/; my $obj = decode_json(q! { "x": "1", "y": "2", "z": "3" } !); my $json = encode_json($obj); DESCRIPTION
Provides a thin wrapper around the JSON 2.xx library, which provides a frontend for JSON::XS and JSON::PP. This module used to wrap JSON::Syck and JSON 1.xx with special-casing for outputting JSON with single quoted values. Single quotes make it easy to simply plop JSON into HTML attributes but are in violation of the JSON spec which mandates only double quoted strings. The old behavior is now unsupported and it is recommended that you simply HTML escape your entire blob of JSON if you are sticking it in an HTML attribute. You can use Jifty->web->escape() to properly escape problematic characters for HTML. FUNCTIONS
decode_json JSON, [ARGUMENT HASHREF] encode_json JSON, [ARGUMENT HASHREF] These functions are just like JSON's, except that you can pass options to them like you can with JSON's "from_json" and "to_json" functions. By default they encode/decode using UTF8 (like JSON's functions of the same name), but you can turn that off by passing "utf8 => 0" in the options. The allow_nonref flag is also enabled for backwards compatibility with earlier versions of this module. It allows encoding/decoding of values that are not references. JSON is imported with the "-support_by_pp" flag in order to support all options that JSON::PP provides when using JSON::XS as the backend. If you are concerned with speed, be careful what options you specify as it may cause the pure Perl backend to be used. Read "JSON::PP SUPPORT METHODS" in JSON for more information. DEPRECATED FUNCTIONS
jsonToObj JSON, [ARGUMENTS] objToJson JSON, [ARGUMENTS] These functions are deprecated and provided for backwards compatibility. They wrap the appropriate function above, but "croak" in Carp if you try to set the "singlequote" option. LICENSE
Jifty is Copyright 2005-2010 Best Practical Solutions, LLC. Jifty is distributed under the same terms as Perl itself. perl v5.14.2 2010-12-08 Jifty::JSON(3pm)
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