UNIX, Linux, and Command Line Basics

Starring Directed By Special Appearance Presented by With

THE NAME OF THIS SPEAKER IS HENNING SCHWENTNER LIVE 45
MIN TALK

!"# Kolleg:in gesucht (Deutschlandweit)

26.05.23 //// Seite 10 WPS - Workplace Solutions GmbH WHY
DO I CARE? § DevOps § Cloud § Docker/Containerization/Virtualization § It’s the 20ies—Even Microsoft <3 Linux § Op: § Servers are typically Linux + Java + (Tomcat) + DB § Start and stop Daemons § Dev: § Tools that help in your developer day

@hschwentner History

@hschwentner UNIX Foto: Dennis Hamilton/flickr/CC BY 2.0 Ken Thompson Dennis
Ritchie 1969 Bell Labs

@hschwentner GNU Richard Stallman Free Software Foundation

@hschwentner UNIX—Diversity Xenix

@hschwentner Linux Linus Thorvalds 1991

@hschwentner Linux—Distributions

@hschwentner Today: Unix Everywhere Windows Terminal WSL is Unix BSD-based

26.05.23 //// Seite 20 WPS - Workplace Solutions GmbH §
FHS § Static/ and Shared/Local Files § First Hierarchy § / § /bin, /sbin § /etc § /root, /home § /proc, /dev, /sys?, /mnt § Second Hierarchy § /usr, /var § /usr/bin, /usr/sbin, /usr/X11/bin § /var/tmp § /var/log § Local Hierarchy § /usr/local § Non-packaged tools vs. non-OS tools § Other tools § /opt THE FILESYSTEM TREE

26.05.23 //// Seite 21 WPS - Workplace Solutions GmbH §
root § groups § user § Rights: § user § group § world ROLES AND RIGHTS

@hschwentner Terminal/ Console/ TTY/Shell

@hschwentner In the old days mainframe (a.k.a. host) terminal terminal

@hschwentner Terminal terminal (noun): a piece of hardware to interact
with a computer

@hschwentner Kinds of terminals console teleprinter, a.k.a teletype(writer), a.k.a. TTY
video terminal (here: VT 100) for admins for users

@hschwentner Terminal emulator terminal emulator (noun): a piece of software
that emulates a terminal

@hschwentner Terminal emulators Windows Terminal macOS Terminal Windows Console (conhost.exe)
iTerm2 XTerm Alacritty

@hschwentner Terminal emulators II

@hschwentner Shell shell (noun): A piece of software to interact
with the kernel. Runs typically in a terminal. There are command-line shells and graphical shells.

@hschwentner CLI shells C shell KornShell Bourne shell Command prompt
PowerShell Fish

@hschwentner Graphical shells

@hschwentner UNIX on Windows

@hschwentner On Windows

@hschwentner Terminal/ Console/ TTY/Shell

@hschwentner /home Command line $ -l ls prompt command

@hschwentner /home Command = argument[] $ -l ls argument 0
arg. 1 arg. 2

@hschwentner /home Anatomy of a command $ -l ls command
option parameter

@hschwentner Important commands • pwd • cd/pushd/popd • ls •
mkdir/touch • rm • cat/tail/less • man • & bg/fg • . and .. • ls -la

@hschwentner Typical options • - and -- • -v --version
• -h --help option (noun): An argument that starts with a dash. Several options can be put into one argument.

@hschwentner Getting help • -h –help • man

@hschwentner Path

@hschwentner Tab completion

@hschwentner PIPELINING • Unix commands are generally working on strings
of characters • STDIN, STDOUT, STDERR • Pipes allow to connect the output of one command to connect to the input of another echo "Hello world" > hallo.txt 2> < echo "Hallo world" | wc

@hschwentner Installers • Debian family • Apt, apt-get, aptitude •
deb/dpkg • snap • Redhat family • yum • rpm • Zypper • Alpine • apk • OS X • Homebrew, (MacPorts, Fink) • Windows • Cygwin • Chocolatey • Winget

@hschwentner SED and GREP

@hschwentner SCRIPTING • Shell scripts • Perl/Python & co. •
Reg Ex • Scripting in Dockerfiles • Shebang: • #!/bin/sh • #!/usr/bin/env perl

@hschwentner Command Line Java • java/javac • jshell • mvn/gradle

We can do it, too!

@hschwentner EXERCISE • On Windows 10: install Windows Terminal/Git Bash/Cygwin
• Create directory learning-unix • Change into that directory • Create a file hello.txt • Change ownership and access of hello.txt • Make it executable

Bibliography Nemeth, Evi, Garth Snyder, Trent R. Hein, Ben Whaley,
and Dan Mackin. UNIX and Linux System Administrators Handbook. 5th ed. Boston: Addison-Wesley, 2017. Raymond, Eric S. The Art of UNIX Programming. Boston: Addison-Wesley, 2004. Hofer, Stefan and Henning Schwentner. Domain Storytelling: a Collaborative, Visual, and Agile Way to Develop Domain- Driven Software. Boston: Addison-Wesley, 2022.

Henning Schwentner ⌂ https://hschwentner.io @hschwentner [email protected]

UNIX, Linux, and Command Line Basics

UNIX, Linux, and Command Line Basics

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