mastering-the-linux-command-line

Material for talk "Mastering the Linux command line".
Read along with git clone https://github.com/bertjan/mastering-the-linux-command-line or at https://github.com/bertjan/mastering-the-linux-command-line.

Opening slides

Title:

clear
printf "\n\n"; printf "Mastering\nthe\nLinux command line" | figlet -ctk; printf "\n\n"; printf '%0.1s' ' '{1..49} && printf "Bert Jan Schrijver\n\n" && printf '%0.1s' ' '{1..48} && printf "[email protected]\n" && printf '%0.1s' ' '{1..52} && printf "@bjschrijver\n\n"

Intro:

(jp2a https://pbs.twimg.com/profile_images/1056994211499786240/qqhVN-Ur_400x400.jpg \
&& echo && echo \
&& wget -q -O - https://www.openvalue.nl/images/openvalue-white.jpg | jp2a - \
&& echo && echo \
&& jp2a https://yt3.ggpht.com/a/AGF-l79fDOsea1hkt8MMeKetvpDDE7qSlRfsKNaJQw=s288-mo-c-c0xffffffff-rj-k-no -i) | less

Special intro for April 5th only:

jp2a https://www.expandior.nl/wp-content/uploads/2021/03/Frank-Walinga-e1618911733788.jpg

Introduction

Assumption: you know the basics like cd, ls, cp, mv.

• Terminal session, shell, bash
• man, help, -h, --help
• pipes: intro

Navigating

• tab completion
• cd -
• find
• locate
• which

History

• up arrow
• history, !! and !
• ctrl-r

File processing

• file
• diff
• vi

Networking

• ssh key authentication, ssh-copy-id, ssh tunneling
• ifconfig (deprecated) -> ip
• ping
• telnet
• curl
• scp, sftp
• rsync

Productivity

• cal
• bc
• .profile
• aliases
• ctrl-a ctrl-e ctrl-l ctrl-d ctrl-c
• less shift-g shift-f
• brace expansion: echo a{d,c,b}e , echo test{1..10}
• watch
• screen

Pipes

• tee
• head, tail (-f)
• cat, grep, awk, cut
• sort, uniq (watch -n 0.1 "cat app.log | grep DispatcherServlet | grep ': GET' | cut -d ':' -f 4- | sort | uniq -c")
• command substitution $(..)
• wc
• sed
• ; vs &&
• Output redirection > >>

System analysis

• top (dd if=/dev/urandom | bzip2 -9 >> /dev/null)
• strace (sudo strace -p $(pidof vi) 2>&1 | grep read)
• vmstat
• netstat
• lsof - lsof -i :8080
• du

Shell scripting

• intro, make executable
• variables
• Command line args
• If/then/else
• functions (function test1 { echo test $1; })

Bonus

• Bats: Bash Automated Testing System
• What's this: :(){ :|:& };:
• telnet telehack.com
• telnet mapscii.me

Questions?

Hit me!

Thanks!

'Slides' are at https://github.com/bertjan. Questions? @bjschrijver on Twitter.