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
I have installed FreeBSD in my system... I have installed it to work in text mode don't have the GUI. The default text color is Black background with White Foreground. I want it to be with Black background with Green Foreground. How could i do that.
Thanks in advance
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Hello,
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Anyone knows how to start a new bash terminal from command line?
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Hi guys and gals...
After much searching on the good ol' internet I could find nothing, so this is the result.
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Hi Gurus,
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{
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Discussion started by: manas_ranjan
4 Replies
LEARN ABOUT DEBIAN
jifty::json
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)