README.md

See also

• yEd/linux_command_line_introduction.graphml
• https://www.youtube.com/watch?v=DBPTyJcH04U

unix

Command line tips and tricks for beginners

• Quick start
• Working directory
• Open folder
• Tab completion
• Go back to previous folder
• Symbolic links
• Aliases
• Key bindings
• Prompt
• find
• Regular expressions
• Move cursor backwards and forwards
• Redirect output
• Others
  • HTTP file server
  • Check what process is listening on a port
  • Processes
  • Kill a process
  • Netcat
  • Popup box
  • Run multiple commands
  • Disk space
  • Disk space consumption
  • History
  • machine info
  • SSH passwordless
  • rsync
  • Scripting
  • Vim
  • Cron
  • Install new software
  • Jar file inspection

Quick start

• create a ~/.bashrc file
• copy the contents of https://raw.githubusercontent.com/sarnobat/unix/master/.bashrc

Video

• https://www.youtube.com/watch?v=DBPTyJcH04U&ab_channel=sarnobat2000

Working directory

pwd

Open folder

open .

Create folder

mkdir test
mkdir mydir/subdir

Go back to previous folder

cd -

Tab completion

For changing directory more quickly

cd my<tab>/su<tab>/

Symbolic links

ln -s ~/mydir/subdir

Prompt

To get more idea where you are

• host
• working directory
• user

PS1='\w > 

Aliases

alias l="ls -lrt"

Key bindings

For quickly executing repetitive commands

Terminal.app:

• Preferences
• Profiles
• Keyboard
• Use Option as Meta Key

bind ' "\el":"ls -lrt\n"'

find

Pipes

find | grep Cache

xargs

find | grep Cache | xargs grep --color powermock

Regular expressions

find -iname "*.java" | sed -e 's/.*src.\(.*\).java/\1/' | sed -e 's/\//./g'

Move cursor backwards and forwards

This comes automatically with Terminal.app

Alt-left

Redirect output

find -iname "*.java" | sed -e 's/.*src.\(.*\).java/\1/' | sed -e 's/\//./g' > out.txt

Others

HTTP file server

Check what process is listening on a port

sudo lsof -i:80

Processes

ps aux

Kill a process

Netcat

Popup box

osascript -e 'display dialog "Built"'

Run multiple commands

;

&&

ls ~/non-existed-file && echo "file exists" || echo "file does not exist"

Disk space

Disk space consumption

History

machine info

SSH passwordless

rsync

Copy large files with progress indication, across a network, and preserve original timestamps.

rsync 

Scripting

~/bin/

Vim

vim

• Syntax highlighting

Cron

crontab -e

Install new software

• https://brew.sh/

Tail a log file

tail

Jar file inspection

unzip

expect

expect

awk

awk

uname -a