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://cdn.bsky.app/img/avatar/plain/did:plc:afctx44qkzvqmqsx4yk5uryd/bafkreig7xutbbqdl5qh42szlgzdjec6vihm7gnplh6ckbnokvlpymspsu4@jpeg -i) | less

Introduction

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

• Terminal session (local or remote), kernel, shell, bash
• man, help, -h, --help (for example: ps has a man page, cd doesnt but it does have a help page. help is bash ony)
• pipes: intro (for example: echo test123 | rev)

Navigating

• tab completion
• cd -
• find (-size -exec)
• locate & updatedb
• which (for example: which npm)

History

• up arrow
• history, !! and ! (for example: sudo !!)
• ctrl-r (you can press it repeatedly)

File processing

• file
• diff (--side-by-side --color)
• vi (i, :q, :wq, /)

Networking

• ssh key authentication, ssh-copy-id, ssh tunneling (ssh 192.168.68.3 -L8080:localhost:8080)
• ifconfig (deprecated) -> ip
• ping
• telnet
• curl
• sftp, scp (both file and dir: scp -r testdir [email protected]:~/testdir)
• rsync (rsync -r testdir/ [email protected]:~/testdir)

Productivity

• cal
• bc (scale, use in scripts)
• .profile
• aliases (alias gp="git pull" & use in .profile)
• 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 (-pant)
• lsof (lsof -i :8080 , lsof demo-app.log)
• 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.