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:
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:
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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Hai Friends
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Discussion started by: manas_ranjan
4 Replies
LEARN ABOUT DEBIAN
template::plugin::json::escape
Template::Plugin::JSON::Escape(3pm) User Contributed Perl Documentation Template::Plugin::JSON::Escape(3pm)NAME
Template::Plugin::JSON::Escape - Adds a .json vmethod and a json filter.
SYNOPSIS
[% USE JSON.Escape( pretty => 1 ) %];
<script type="text/javascript">
var foo = [% foo.json %];
var bar = [% json_string | json %]
</script>
or read in JSON
[% USE JSON.Escape %]
[% data = JSON.Escape.json_decode(json) %]
[% data.thing %]
DESCRIPTION
This plugin allows you to embed JSON strings in HTML. In the output, special characters such as "<" and "&" are escaped as "uxxxx" to
prevent XSS attacks.
It also provides decoding function to keep compatibility with Template::Plugin::JSON.
FEATURES
USE JSON.Escape
Any options on the USE line are passed through to the JSON object, much like "to_json" in JSON.
json vmethod
A ".json" vmethod converts scalars, arrays and hashes into corresponding JSON strings.
[% json_stuct = { foo => 42, bar => [ 1, 2, 3 ] } %]
<script>
var json = [% json_struct.json %];
</script>
<span onclick="doSomething([% json_struct.json %]);">
json filter
A "json" filter escapes "<", ">", "&", "+", "U+2028" and "U+2029" as "uxxxx". In the attribute, you may just use an "html" filter.
[% json_string = '{ "foo": 42, "bar": [ 1, 2, 3 ] }' %]
<script>
var json = [% json_string | json %];
</script>
<span onclick="doSomething([% json_string | html %]);">
json_decode method
A "json_decode" method allow you to convert from a JSON string into a corresponding data structure.
[% SET json_struct = JSON.Escape.json_decode(json_string) %]
[% json_struct.foo | html %]
SEE ALSO
Template::Plugin::JSON, JSON, Template::Plugin
VERSION CONTROL
https://github.com/nanto/perl-Template-Plugin-JSON-Escape <https://github.com/nanto/perl-Template-Plugin-JSON-Escape>
AUTHOR
nanto_vi (TOYAMA Nao) <nanto@moon.email.ne.jp>
COPYRIGHT & LICENSE
Copyright (c) 2011 nanto_vi (TOYAMA Nao).
Copyright (c) 2006, 2008 Infinity Interactive, Yuval Kogman.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
perl v5.14.2 2011-06-13 Template::Plugin::JSON::Escape(3pm)