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Linux tricks

BLAS/LAPACK on Debian/Ubuntu

BLAS:

$ sudo update-alternatives --config libblas.so.3

LAPACK:

$ sudo update-alternatives --config liblapack.so.3

On ubuntu one must use openblas with standard lapack for numpy to work.

to install openblas

$ sudo apt-get install libopenblas-base

Note that the number of threads used by openblas can be set manually by:

$ export OPENBLAS_NUM_THREADS=1

Install certificate for ssh connexion

In order to allow certificate based connexion to a ssh server

$ ssh-copy-id -i ~/.ssh/id_rsa.pub login@server

.ssh/confif file

Simple examples for ssh config file

Host github.com
  Hostname ssh.github.com
  Port 443
Host other_pc
  Hostname 192.168.0.something
  User username 
Host cproxy
  Hostame 192.168.0.something
  User username
  ProxyCommand ssh [email protected] -W %h:%p
Host cproxy_other
  Hostame 192.168.0.something
  ProxyJump other_pc

Amazon aws

Copy all file in a folder to an aws s3 folder

$ ls * |xargs -n 1 -I {} aws s3 cp {} "s3://URL"

Convert images to mp4 movie

$ convert -delay 20 *.png movie.mp4

Disable autofocus opn webcam

$ v4l2-ctl --set-ctrl=focus_auto=0

Get SSL let's encrypt certificate

Think about descativating nginx so that the temporary server works and install the wawesome certbot

$ sudo certbot certonly --rsa-key-size 2048 --standalone --agree-tos --no-eff-email --email [email protected] -d your.server.com

keys will be stored for use in apache/nginx in /etc/letsencrypt/live/your.server.com/fullchain.pem