Sponsored Content
Top Forums Shell Programming and Scripting Building JSON command with bash script Post 303038939 by psysc0rpi0n on Tuesday 17th of September 2019 04:51:21 PM
Old 09-17-2019
Building JSON command with bash script

Hello.
I'm new to bash script and I'm learning the basics by writing some scripts.
Recently a friend of mine asked me if I could try to write a script to him to automate a couple of processes that uses JSON RPCs.

I'll try to explain in few words the workflow just to contextualize the problem.
There is an app which runs as a deamon. This app is the one which parses the commands and sends them to the remote server. It also receives the response and then sends it to another more userfriendly app which is the app the user interacts with.

Something like this:
  • daemon starts
  • user-firendly app send RPC command to daemon
  • daemon parses it and sends to the remote server
  • daemon gets the response and parses it to user friendly format
  • user-friendly app prints the JSON object nicely formatted.

One of these commands takes up to 8 parameters and 2 of these 8 parameters are lists of items.
The format is as follows:
Code:
app-name option1 "param1" "{\"item1\":num1,\"item2\":num2, \"item_n\":num_n}" num3 "param2" "[\"item3\",\"item4\",\"item_n\"]" param4 num5 "param5"

The goal here is to make the items inside those two lists, dynamic, I mean, I load those items from a file, line by line, then num1, num2 and num_n are evaluated in the code and used there. Other params are kind of static.

I already have a version that builds this command correctly with all brackets and double quotes and all special chars in place but the problem is that in the way I did it, JSON parser sees the whole command as a single long string and cannot be that way.
What I did in the code I have, was simply append the static parts of the command before and after of dynamically add the list items with for loops. But as I said, I did it in a way that it's just a huge single string.

JSON RPC expects each parameter as separate strings.

The other factor adding some complexity is what I mentioned of adding items to the lists dynamically. As those items are loaded from a file, it all depends on how many items there are in the file!

Does anyone knows a way of doing this with bash script?
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Building command line parameters of arbitrary length

I couldn't find an existing thread that addressed this question, so hopefully this isn't redundant with anything previously posted. Here goes: I am writing a C-Shell script that runs a program that takes an arbitrary number of parameters: myprog -a file1 \ -b file2 \ -c file3 ... \ -n... (2 Replies)
Discussion started by: cmcnorgan
2 Replies

2. Shell Programming and Scripting

BASH SCRIPT of LS command

I need help in writing a BASH SCRIPT of ls command. for example: $ ./do_ls.sh files f1.txt f2.jpeg f3.doc $ ./do_ls.sh dirs folder1 folder2 folder3 My attempt: #!/bin/bash # if test $# -d file then echo $dirs else (3 Replies)
Discussion started by: above8k
3 Replies

3. Shell Programming and Scripting

How to define a variable in a BASH script by using a JSON file online?

Hello, I would like to modify an existing script of mine that uses a manually defined "MCVERSION" variable and make it define that variable instead based on this JSON file stored online: https://s3.amazonaws.com/Minecraft.Download/versions/versions.json Within that JSON, I 'm looking for... (4 Replies)
Discussion started by: nbsparks
4 Replies

4. Shell Programming and Scripting

Bash script - cygwin (powershell?) pull from GitHub API Parse JSON

All, Have a weird issue where i need to generate a report from GitHub monthly detailing user accounts and the last time they logged in. I'm using a windows box to do this (work issued) and would like to know if anyone has any experience scripting for GitAPI using windows / cygwin / powershell?... (9 Replies)
Discussion started by: ChocoTaco
9 Replies

5. Shell Programming and Scripting

UNIX or Perl script to convert JSON to CSV

Is there a Unix or Perl script that converts JSON files to CSV or tab delimited format? We are running AIX 6.1. Thanks in advance! (1 Reply)
Discussion started by: warpmail
1 Replies

6. Shell Programming and Scripting

Parsing and Editing a json file with bash script

I am trying to automate editing of a json file using bash script. The file I initially receive is { "appMap": { "URL1": { "name": "a" }, "URL2": { "name": "b" }, "URL3": { "name": "c" }, } WHat I would like to do is replace... (5 Replies)
Discussion started by: Junaid Subhani
5 Replies

7. UNIX for Beginners Questions & Answers

Json field grap via shell script/awk

i have a json data that looks like this: { "ip": "16.66.35.10", "hostname": "No Hostname", "city": "Stepney", "region": "England", "country": "GB", "loc": "51.57,-0.0333", "org": "AS6871 British Telecommunications PLC", "postal": "E1" } im looking for a way to assign... (9 Replies)
Discussion started by: SkySmart
9 Replies

8. Shell Programming and Scripting

JSON structure to table form in awk, bash

Hello guys, I want to parse a JSON file in order to get the data in a table form. My JSON file is like this: { "document":{ "page": }, { "column": } ] }, { ... (6 Replies)
Discussion started by: Gescad
6 Replies

9. Shell Programming and Scripting

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... (1 Reply)
Discussion started by: kbrazil
1 Replies

10. UNIX for Beginners Questions & Answers

How to convert any shell command output to JSON format?

Hi All, I am new to shell scripting, Need your help in creating a shell script which converts any unix command output to JSON format output. example: sample df -h command ouput : Filesystem size used avail capacity Mounted /dev/dsk/c1t0d0s0 8.1G 4.0G 4.0G 50% /... (13 Replies)
Discussion started by: balu1234
13 Replies
Mojolicious::Plugin::JSONConfig(3pm)			User Contributed Perl Documentation		      Mojolicious::Plugin::JSONConfig(3pm)

NAME
Mojolicious::Plugin::JSONConfig - JSON configuration plugin SYNOPSIS
# myapp.json { "foo" : "bar", "music_dir" : "<%= app->home->rel_dir('music') %>" } # Mojolicious my $config = $self->plugin('JSONConfig'); # Mojolicious::Lite my $config = plugin 'JSONConfig'; # Reads "myapp.json" by default my $config = app->config; # Everything can be customized with options my $config = plugin JSONConfig => {file => '/etc/myapp.conf'}; DESCRIPTION
Mojolicious::Plugin::JSONConfig is a JSON configuration plugin that preprocesses it's input with Mojo::Template. The application object can be accessed via $app or the "app" function. You can extend the normal config file "myapp.json" with "mode" specific ones like "myapp.$mode.json". A default configuration filename will be generated by decamelizing the application class with "decamelize" in Mojo::Util or from the application filename. The code of this plugin is a good example for learning to build new plugins, you're welcome to fork it. OPTIONS
Mojolicious::Plugin::JSONConfig inherits all options from Mojolicious::Plugin::Config and supports the following new ones. "template" # Mojolicious::Lite plugin JSONConfig => {template => {line_start => '.'}}; Attribute values passed to Mojo::Template object used to preprocess configuration files. METHODS
Mojolicious::Plugin::JSONConfig inherits all methods from Mojolicious::Plugin::Config and implements the following new ones. "parse" $plugin->parse($content, $file, $conf, $app); Process content with "render" and parse it with Mojo::JSON. sub parse { my ($self, $content, $file, $conf, $app) = @_; ... $content = $self->render($content, $file, $conf, $app); ... return $hash; } "register" my $config = $plugin->register($app, $conf); Register plugin in Mojolicious application. "render" $plugin->render($content, $file, $conf, $app); Process configuration file with Mojo::Template. sub render { my ($self, $content, $file, $conf, $app) = @_; ... return $content; } SEE ALSO
Mojolicious, Mojolicious::Guides, <http://mojolicio.us>. perl v5.14.2 2012-09-05 Mojolicious::Plugin::JSONConfig(3pm)
All times are GMT -4. The time now is 11:51 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy