Text file based presentation tool – pinpoint

Pinpoint description:

Name        : pinpoint

Summary     : A tool for making hackers do excellent presentations

URL         : https://live.gnome.org/Pinpoint

License     : LGPLv2+

Description : Pinpoint a simple presentation tool that hopes to avoid audience death

by bullet point and instead encourage presentations containing

beautiful images and small amounts of concise text in slides.

Pinpoint is a presentation tool. The source file for the presentation is text file and thus very easy to manage. You can see an example with :

Executing commands on multiple hosts

If you have to execute the same command in multiple hosts, then you can use mussh:

Description : Mussh is a shell script that allows you to execute a command or script

over ssh on multiple hosts with one command. When possible mussh will use

ssh-agent and RSA/DSA keys to minimize the need to enter your password

more than once.

First install mussh with the following command

dnf install mussh

Now to run this for multiple hosts, you can run like this

Network Manager post-up script (dispatcher script)

Network manager is supposed to be much better than network, how so?

it supports dnsmasq for one…

Dnsmasq with netowrkmanager

Local name resolution

Also Network Manager supports dispatcher scripts. How can that help? For one, I used to send interface up emails. To do so, all I had to do was put the following script in “/etc/NetworkManager/dispatcher.d”

#!/bin/sh

cd /etc/sysconfig/network-scripts
. ./network-functions

[ -f ../network ] && . ../network

# Notify programs that have requested notification
IF=$1
STATUS=$2

cat

dnsmasq local name resolution with NetworkManager

Network Manager suports starting dnsmasq which helps you have a local cache for DNS thus getting faster resolution for the DNS queries.

Dnsmasq with netowrkmanager

So, one thing that I have been thinking about is having a local name resolution for the VMs. So, I wanted something like this to work:

vm1 => 172.17.42,1

vm2 => 172.17.42,2

and so on …

To achieve this and reverse dns to work, we will add the entries in file “/etc/NetworkManager/dnsmasq.d/hostnames“. Just one more problem, adding so many entries manually? So, to help you with that, I created this small script:

bash – expand shell variables ( bash bug resolved )

As you would have noticed in the recent versions of bash, expansion does not work properly when expanding directory names. So, for something like this

cd $varname

if you press tab, then variable name does not expand properly.

If this is something that is bothering you then you can now add the following in your bashrc and revert to older behaviour:

shopt -s direxpand

Hope this helps you.

ShellCheck – check basic POSIX shell script errors

Here is description of the tool:

Description : The goals of ShellCheck are:

• To point out and clarify typical beginner’s syntax issues,
  :   that causes a shell to give cryptic error messages.

• To point out and clarify typical intermediate level semantic
  :   problems, that causes a shell to behave strangely and
  :   counter-intuitively.

• To point out subtle caveats, corner cases and pitfalls, that may
  :   cause an advanced user’s otherwise working script to fail under
  :   future circumstances.

To install

evvsubst – substitute variables in text in shell

First you need to install gettext, which by the way might be already installed, however you can install with

dnf install gettext

Details of the package:

Name        : gettext

Arch        : x86_64

Epoch       : 0

Version     : 0.19.4

Release     : 4.fc22

Size        : 4.6 M

Repo        : @System

Summary     : GNU libraries and utilities for producing multi-lingual messages

URL         : http://www.gnu.org/software/gettext/

License     : GPLv3+ and LGPLv2+

Description : The GNU gettext package provides a set of tools and documentation for

producing multi-lingual messages in programs. Tools include a set of

conventions about how programs should be written to support message

catalogs, a directory and file naming organization for the message

catalogs, a runtime library which supports the retrieval of translated

messages, and stand-alone programs for handling the translatable and

the already translated strings. Gettext provides an easy to use

library and tools for creating, using, and modifying natural language

catalogs and is a powerful and simple method for internationalizing

programs.

Usage examples: