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How to use graphical widgets in bash scripts with zenity

Zenity is a very useful utility which let us create graphical user interfaces for our shell scripts. Several widgets exists, and can be used by invoking the program with the respective options. The widgets are based on the GTK toolkit, and return the result of the user interaction either on the standard output or as a return code.

In this tutorial you will learn:

  • What are the general zenity options
  • What are the some of the most useful available widgets and how to use them

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How to create a selection menu using the select statement in Bash shell

How to create a selection menu using the select statement in Bash shell

We all very often use bash scripts to automatize boring and repetitive tasks. Sometimes in our scripts we need to ask
the user to perform one or more choices interactively: in this tutorial we will see how to use the Bash shell select statement to perform such operation in very few lines of code.

In this tutorial you will learn:

  • How to use the Bash select statement
  • How to customize the select menu prompt

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Transmission Web Interface

How to set up transmission-daemon on a Raspberry Pi and control it via web interface

Introduction

Transmission is probably the most famous torrent client in the Gnu/Linux world, and it’s very often used even on other operating systems. It’s really easy to use, and its graphical interface is very intuitive; however in this tutorial we will see how to install transmission-daemon and run transmission on a headless machine: that’s an ideal setup to create a “Torrent-box”, using for example a Raspberry Pi, to reduce power usage.

Once installed and configured, we will be able to manage the application using the web interface. For the sake of this tutorial I will install transmission-daemon on a Raspberry Pi, using the Raspbian operating system, however the same instructions should work on Ubuntu and Debian.

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Bash Script Comment Example

How to write comments in Bash Scripts

Well you have written an awesome Bash script. It works perfectly and perhaps there is no need to add new functionality. Well, maybe not for now, at least! At this stage you are happy with the script. However, after few months you reopen your bash script again to add new feature and you get a headache to figure out on how the script actually works. Hence, you need to spend additional energy and time before you can actually start editing the script in order to add new feature.

Well, at this point you regret that you did not put some comments ( notes ) into the script to remind you of how the bash script is structured. Not only that Bash comments serve as excellent notes for you or anybody else who might work with your script they may be to some extend also used as a basic bash script debugging tool.

In this tutorial you will learn:

  • How to comment on bash command line
  • How to write comment bash scripts
  • How to create multiple line comments

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Bash Terminal

How to Debug Bash Scripts

There are techniques from traditional programming environments that can help.
Some basic tools like using an editor with syntax highlighting will help as well.
There are builtin options that Bash provides to make debugging and your everyday Linux System Administration job easier.

In this article you will learn some useful methods of debugging Bash scripts:

  • How to use traditonal techniques
  • How to use the xtrace option
  • How to use other Bash options
  • How to use trap

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bash scripting

How to modify scripts behavior on signals using bash traps

Objective

The objective of this tutorial is to describe how to use the bash shell trap builtin to make our scripts able to perform certain actions when they receive a signal or in other specific situations.

Requirements

  • No special requirements

Difficulty

EASY

Conventions

  • # – requires given linux commands to be executed with root privileges either
    directly as a root user or by use of sudo command
  • $ – requires given linux commands to be executed as a regular non-privileged user

Introduction

bash scriptingWhen writing scripts that are meant to run for a considerable time, it’s very important to increase their robustness by making them able to react to system signals, executing specific actions when some of them are received. We can accomplish this task by using the bash trap builtin.

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