Add element.sh

element.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+PSQL="psql --username=freecodecamp --dbname=periodic_table -t --no-align -c"
+
+if [[ ! $1 ]]; then
+  echo "Please provide an element as an argument."
+  exit 0
+fi
+
+if [[ $1 =~ ^[0-9]+$ ]]; then
+  ELEMENT_RESULT=$($PSQL "SELECT elements.atomic_number, symbol, name, atomic_mass, melting_point_celsius, boiling_point_celsius, type FROM elements INNER JOIN properties USING(atomic_number) INNER JOIN types USING(type_id) WHERE atomic_number = $1")
+else
+  ELEMENT_RESULT=$($PSQL "SELECT elements.atomic_number, symbol, name, atomic_mass, melting_point_celsius, boiling_point_celsius, type FROM elements INNER JOIN properties USING(atomic_number) INNER JOIN types USING(type_id) WHERE symbol = '$1' OR name = '$1'")
+fi
+
+if [[ -z $ELEMENT_RESULT ]]; then
+  echo "I could not find that element in the database."
+  exit 0
+fi
+
+ATOMIC_NUMBER=$(echo "$ELEMENT_RESULT" | cut -d'|' -f1)
+SYMBOL=$(echo "$ELEMENT_RESULT" | cut -d'|' -f2)
+NAME=$(echo "$ELEMENT_RESULT" | cut -d'|' -f3)
+ATOMIC_MASS=$(echo "$ELEMENT_RESULT" | cut -d'|' -f4)
+MELTING_POINT=$(echo "$ELEMENT_RESULT" | cut -d'|' -f5)
+BOILING_POINT=$(echo "$ELEMENT_RESULT" | cut -d'|' -f6)
+TYPE=$(echo "$ELEMENT_RESULT" | cut -d'|' -f7)
+
+echo "The element with atomic number $ATOMIC_NUMBER is $NAME ($SYMBOL). It's a $TYPE, with a mass of $ATOMIC_MASS amu. $NAME has a melting point of $MELTING_POINT celsius and a boiling point of $BOILING_POINT celsius."