Open a new blank file and add the following to it:
#!/bin/bashPI=3.14VAR_A=10VAR_B=$VAR_AVAR_C=${VAR_B}echo "Let's print 3 variables:"echo $VAR_Aecho $VAR_Becho $VAR_Cecho "We know this will break:"echo "0. The value of PI is $PIabc" # since PIabc is not declared, it will be empty stringecho "And these will work:"echo "1. The value of PI is $PI"echo "2. The value of PI is ${PI}"echo "3. The value of PI is" $PIecho "And we can make a new string"STR_A="Bob"STR_B="Jane"echo "${STR_A} + ${STR_B} equals Bob + Jane"STR_C=${STR_A}" + "${STR_B}echo "${STR_C} is the same as Bob + Jane too!"echo "${STR_C} + ${PI}"exit 0
Notice the nomenclature. It is great to use a standardized mechanism to name variables, but to use
