Command expansion, I use a lot
echo something $( date +%s )
Backticks also work for command expansion
echo something `date +%s`
...but do they work any differently to $( )?
Conditionals, like an if statement, use square brackets
if [ "$end_hour" = "24" ]; then ....; fi
Arithmetic, like 1 + 2, uses this:
i=$(( i + 1 ))See http://www.softpanorama.org/Scripting/Shellorama/arithmetic_expressions.shtml
let i+=1
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