28 lines
1.4 KiB
Bash
28 lines
1.4 KiB
Bash
#!/bin/bash
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PSQL="psql --username=freecodecamp --dbname=periodic_table -t --no-align -c"
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if [[ ! $1 ]]; then
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echo "Please provide an element as an argument."
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exit 0
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fi
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if [[ $1 =~ ^[0-9]+$ ]]; then
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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 = $1")
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else
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ELEMENT_RESULT=$($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'")
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fi
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if [[ -z $ELEMENT_RESULT ]]; then
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echo "I could not find that element in the database."
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exit 0
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fi
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ATOMIC_NUMBER=$(echo "$ELEMENT_RESULT" | cut -d'|' -f1)
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SYMBOL=$(echo "$ELEMENT_RESULT" | cut -d'|' -f2)
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NAME=$(echo "$ELEMENT_RESULT" | cut -d'|' -f3)
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ATOMIC_MASS=$(echo "$ELEMENT_RESULT" | cut -d'|' -f4)
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MELTING_POINT=$(echo "$ELEMENT_RESULT" | cut -d'|' -f5)
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BOILING_POINT=$(echo "$ELEMENT_RESULT" | cut -d'|' -f6)
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TYPE=$(echo "$ELEMENT_RESULT" | cut -d'|' -f7)
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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." |