Linux

ping and get ip only bash

getent ahostsv4 wildvm.local | awk '{print $1}' | head -1

Free up disk space on linux with bleachbit

wget https://download.bleachbit.org/bleachbit_2.2_all_ubuntu1804.deb
sudo apt-get install python-gtk2 -y
apt --fix-broken install
apt-get install python-gtk2 -y
dpkg -i bleachbit_2.2_all_ubuntu1804.deb
bleachbit --list | grep -E "[a-z0-9_\-]+\.[a-z0-9_\-]+" | xargs bleachbit --clean

Create a ssh key with a simple one liner.

HOSTNAME=`hostname` ssh-keygen -t rsa -C "$HOSTNAME" -f "$HOME/.ssh/id_rsa" -P "" && cat ~/.ssh/id_rsa.pub

The easy way to unmount sshfs goes as follows

sudo umount -l directory

Use -l “lazy” which is required for unmounting sshfs

-l, --lazy              detach the filesystem now, clean up things later

Speed up rsync over lan or wan with this simple addition to your command.

-e "ssh -T -c aes128-ctr -o Compression=no -x"

Her we use the new command in a safe (dry run) example

rsync -avn --progress -e "ssh -T -c aes128-ctr -o Compression=no -x" source/ user@x.x.x.x:/destination

It is easy to use Python with forever.js:

forever start -c python python_script.py

To use it with virtualenv is a little bit more complicated, I did it using a bash script (call it python_virtualenv):

#!/bin/bash
# Script to run a Python file using the local virtualenv
source bin/activate
bin/python $@

Now use that script with forever:

forever start -c ./python_virtualenv python_script.py

Easy one liner to install nodejs and forever on Ubuntu 18.04

apt-get install -y nodejs-dev npm ; npm install forever -g

xscreensaver -no-splash

Add the above command to your startup applications.

mkdir -p /etc/run/systemd/resolve
ln -sr /etc/run/systemd/resolve/resolv.conf /etc/run/systemd/resolve/stub-resolv.conf

Now add a nameserver to stub-resolv.conf

nameserver 1.1.1.1
nameserver 1.0.0.1

RUN apt-get update -y
RUN apt-get install -y libgmp-dev re2c libmhash-dev libmcrypt-dev file
RUN ln -s /usr/include/x86_64-linux-gnu/gmp.h /usr/local/include/
RUN docker-php-ext-configure gmp 
RUN docker-php-ext-install gmp
RUN docker-php-ext-configure mcrypt
RUN docker-php-ext-install mcrypt

RUN echo extension=gmp.so > $PHP_INI_DIR/conf.d/gmp.ini
RUN echo extension=mcrypt.so > $PHP_INI_DIR/conf.d/mcrypt.ini

dconf write /org/gnome/desktop/interface/cursor-size 48

Fix fatal error: curl/curl.h: No such file or directory

apt-get install libcurl4-openssl-dev

or

apt-get install libcurl4-gnutls-dev

Fix fatal error: gmp.h: No such file or directory

apt-get install  libgmp3-dev

Fix fatal error: mysql.h: No such file or directory

apt-get install libmysqlclient-dev

sudo apt-add-repository -y ppa:teejee2008/ppa ; apt-get update ; sudo apt-get install -y ukuu ; sudo ukuu --check ; sudo ukuu --install-latest --yes

Reboot!

Get the location of any server from the command line geolocate bash

curl ipinfo.io/X.X.X.X

This is the easiest way to check if the last command was succesful in bash.

your_command_to_test
if [ $? -eq 0 ]; then
echo OK
else
echo FAIL
fi

Install CUDA 9.0 on Ubuntu 16.04 using apt-get – easiest method

First install and switch default gcc to gcc 7.1

sudo apt-get install build-essential software-properties-common -y && \
sudo add-apt-repository ppa:ubuntu-toolchain-r/test && sudo apt-get update && sudo apt-get install -y g++-7 gcc-7 && \
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 60 --slave /usr/bin/g++ g++ /usr/bin/g++-7 && \
sudo update-alternatives --config gcc

Now setup

wget http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64/cuda-repo-ubuntu1604_9.1.85-1_amd64.deb
sudo dpkg -i cuda-repo-ubuntu1604_9.1.85-1_amd64.deb
sudo apt-get update
sudo apt-get install -y cuda-9-1

Reboot!