SHELL

Bash

echo "Hello, World!"

bash!

# GNU Bash or simply Bash is a Unix shell and command language written
# by Brian Fox for the GNU Project as a free software replacement for 
# the Bourne shell. 

Bash

git commit && git push
git commit || echo "Commit failed"

bash

grep " jane " ../data/list.txt | cut -d ' ' -f 1
content_copy

bash

echo # print something in the terminal
sudo # Run a command as an administator
set # Environment variables
export # Make an environment variable
login #login (arch linux)
rm # Remove a file
rmdir # Remove an empty directory
apt # apt package manager (Debian and Debian-based systems only)

bash

awk 'BEGIN{printf "%.3f
", (5+50*3/20 + (19*2)/7)}'
17.929