The Bourne shell (/bin/sh) is present on all Unix installations and scripts written in this language are (quite) portable; man 1 sh is a good reference. Basics

Variables and arguments

Assign with variable=value and get content with $variable MESSAGE=”Hello World” # Assign a string PI=3.1415 # Assign a decimal number N=8 TWON=`expr $N * 2` […]