Consider adding $variables

[jgraup]

Command	Description
[variable]=[value]	Set variable equal to value
[command] $[variable]	Use variable's value by adding $ before the name

Examples

x=12345
echo $x

timestamp=`date +%Y-%m-%d`
echo $timestamp;

hello=hello;
world=world;
echo $hello $world

[0nn0]

Not considered basics in my opinion, therefore leaving it out for now. Thanks for the suggestions though!