bash: command substitution with backticks and $()
bash: command substitution with backticks and $()

erictleung/programming-notes,erictleung/programming-notes,erictleung/programming-notes,erictleung/programming-notes,erictleung/programming-notes,erictleung/programming-notes,erictleung/programming-notes,erictleung/programming-notes,erictleung/programming-notes