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Mastering Bash

You're reading from Mastering Bash A Step-by-Step Guide to working with Bash Programming and Shell Scripting

Product type Paperback

Published in Jun 2017

Publisher Packt

ISBN-13 9781784396879

Length 502 pages

Edition 1st Edition

Languages

Bash

Tools

Bash

Concepts

Shell Scripting

Author (1):

Zarrelli

View More author details

Table of Contents (22) Chapters

Title Page

Credits

About the Author

About the Reviewer

www.PacktPub.com

Customer Feedback

Preface

1. Let's Start Programming FREE CHAPTER

2. Operators

3. Testing

4. Quoting and Escaping

5. Menus, Arrays, and Functions

6. Iterations

7. Plug into the Real World

8. We Want to Chat

9. Subshells, Signals, and Job Controls

10. Lets Make a Process Chat

11. Living as a Daemon

12. Remote Connections over SSH

13. Its Time for a Timer

14. Time for Safety

1. Use in Real World Application

Environment variables

Let's call it a proof of concept more than a real means to have processes communicate with each other. Who would really want to mess with the environment? Anyway, we are some viable means to IPC, so we can take this in account even though we will not use it in the first instance. Let's have a look at env:

env
LS_COLORS=REDACTED
XDG_MENU_PREFIX=xfce-
LANG=en_GB.utf8
DISPLAY=:0.0
XDG_VTNR=7
SSH_AUTH_SOCK=/tmp/ssh-MgHTC62oCYDp/agent.1121
GLADE_CATALOG_PATH=:
XDG_SESSION_ID=2
XDG_GREETER_DATA_DIR=/var/lib/lightdm/data/zarrelli
USER=zarrelli
GLADE_MODULE_PATH=:
DESKTOP_SESSION=xfce
PWD=/home/zarrelli
HOME=/home/zarrelli
GUAKE_TAB_UUID=b07321dd-a221-41bd-8ecc-0ae94b9082b9
SSH_AGENT_PID=1159
QT_ACCESSIBILITY=1
XDG_SESSION_TYPE=x11
XDG_DATA_DIRS=/usr/share/xfce4:/usr/local/share/:/usr/share/:/usr/share
XDG_SESSION_DESKTOP=xfce
GLADE_PIXMAP_PATH=:
GTK_MODULES=gail:atk-bridge
TERM=xterm
SHELL=/bin/bash
XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0
XDG_CURRENT_DESKTOP=XFCE...

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Authors (1)

Zarrelli

Zarrelli

Giorgio Zarrelli is a passionate GNU/Linux system administrator and Debian user, but has worked over the years with Windows, Mac, and OpenBSD, writing scripts, programming, installing and configuring services--whatever is required from an IT guy. He started tinkering seriously with servers back in his university days, when he took part in the Computational Philosophy Laboratory and was introduced to the Prolog language. As a young guy, he had fun being paid for playing games and write about them in video game magazines. Then he grew up and worked as an IT journalist and Nagios architect, and recently moved over to the threat intelligence field, where a lot of interesting stuff is happening nowadays. Over the years, he has worked for start-ups and well-established companies, among them In3 incubator and Onebip as a database and systems administrator, IBM as QRadar support, and Anomali as CSO, trying to find the best ways to help companies make the best out of IT. Giorgio has written several books in Italian on different topics related to IT, from Windows security to Linux system administration, covering MySQL DB administration and Bash scripting.

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