Cheatsheet

This page aim is just a reminder of useful commands, at least for me :)

Reminder

Most of those commands are working with bash, I do not try other shells.

Network and services

Check serivces on a specific port

lsof -i :5000

Iptables

sudo iptables -L
sudo iptables --line -vnL

Check if Apache server is working i.e. listening on port 80

sudo netstat -anp |grep apache

check if default page of apache is working (if no browser)

wget http://127.0.0.1/ -O /dev/null
curl -4 http://ip

Find Listening Network Ports

netstat -tulpn

Run simple http server

python3 -m http.server

Multimedia

Resize jpg

The convert program is a member of the ImageMagick(1) suite of tools. Source

convert image.jpg resize 960x1280 image.jpg

Convert image with hotizontal mirror effect

convert -flop cursiveLetters.pdf cursiveLettersMirror.pdf

Cut a video from a start time to specific end time

ffmpeg -i henri.webm -ss 00:04:52 -t 00:08:52 -async 1 file_name.mp4

Development

Install node/npm through nvm, fix binary path issue

If we install node through apt-get, the globally installed package installation will fail when the symlink will be created into the /usr/bin folder. Instead of using sudo, it is better to use nvm, indeed we will be able to choose which version to install. However after a successful installation, the path of node, and npm will be something like /home/tom/.nvm/versions/node/v10.17.0/bin/node. Even if this path is in PATH, I have encountered a case where node is looked for in /usr/bin, so we need to add a symlink to solve all potential issues.

nodepath=$(which node); sudo ln -s $nodepath /usr/bin/node
npmpath=$(which npm); sudo ln -s $npmpath /usr/bin/npm

Linux

Delete terminal history

history -cw

Docker

Run a container and attach a shell

#Get a image id 
docker image ls

#Run it 
docker run -it <image-id> /bin/bash

Tmux

Create a session

tmux new -s <session_name>

Detach a session

Ctrl^b d

List all sessions

tmux ls

Attach a session

tmux attach-session -t <session_name>

Kill a session

If you are in an attached sesion just type :

exit

Or from outside :

tmux kill-session -t <session_name>

Latex

Indent your .tex files :

latexindent comes automatically after intalling latex in your distrubution. The following command overwrite the file but create a backup.

latexindent --overwrite myLatexFile.tex