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.
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Hi Gurus,
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{
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Discussion started by: manas_ranjan
4 Replies
LEARN ABOUT DEBIAN
json_xs
JSON_XS(1p) User Contributed Perl Documentation JSON_XS(1p)NAME
json_xs - JSON::XS commandline utility
SYNOPSIS
json_xs [-v] [-f inputformat] [-t outputformat]
DESCRIPTION
json_xs converts between some input and output formats (one of them is JSON).
The default input format is "json" and the default output format is "json-pretty".
OPTIONS -v Be slightly more verbose.
-f fromformat
Read a file in the given format from STDIN.
"fromformat" can be one of:
json - a json text encoded, either utf-8, utf16-be/le, utf32-be/le
storable - a Storable frozen value
storable-file - a Storable file (Storable has two incompatible formats)
clzf - Compress::LZF format (requires that module to be installed)
yaml - YAML (avoid at all costs, requires the YAML module :)
eval - evaluate the given code as (non-utf-8) Perl, basically the reverse of "-t dump"
-t toformat
Write the file in the given format to STDOUT.
"toformat" can be one of:
json, json-utf-8 - json, utf-8 encoded
json-pretty - as above, but pretty-printed
json-utf-16le, json-utf-16be - little endian/big endian utf-16
json-utf-32le, json-utf-32be - little endian/big endian utf-32
storable - a Storable frozen value in network format
storable-file - a Storable file in network format (Storable has two incompatible formats)
clzf - Compress::LZF format
yaml - YAML
dump - Data::Dump
dumper - Data::Dumper
Note that Data::Dumper doesn't handle self-referential data structures correctly - use "dump" instead.
EXAMPLES
json_xs -t null <isitreally.json
"JSON Lint" - tries to parse the file isitreally.json as JSON - if it is valid JSON, the command outputs nothing, otherwise it will print
an error message and exit with non-zero exit status.
<src.json json_xs >pretty.json
Prettify the JSON file src.json to dst.json.
json_xs -f storable-file <file
Read the serialised Storable file file and print a human-readable JSON version of it to STDOUT.
json_xs -f storable-file -t yaml <file
Same as above, but write YAML instead (not using JSON at all :)
lwp-request http://cpantesters.perl.org/show/JSON-XS.json | json_xs
Fetch the cpan-testers result summary "JSON::XS" and pretty-print it.
AUTHOR
Copyright (C) 2008 Marc Lehmann <json@schmorp.de>
perl v5.14.2 2010-08-17 JSON_XS(1p)