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Condition

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If syntax ​

shell
if [[ expression1 ]]; then
  echo 'First condition satisfied!!'
elif [[ expression2 ]]; then
  echo 'Second condition satisfied!!'
else
  echo 'No conditions satisfied.'
fi

Case syntax ​

shell
case $FRUIT in
  apple) echo Here is your apple.  ;;
  banana) echo Here is your banana.  ;;
  *) exit 1 ;;
esac