http://www.basicallytech.com/blog/index.php?/archives/23-command-line-calculations-using-bc.html
time echo 'scale=10000; 4*a(1)' | bc -l -q

cat /dev/urandom | md5sum
\\ 

apt install sysbench
sysbench –test=cpu –threads=12 run


apt install p7zip-full
7z b