How To Bash Shell Find Out If a Variable Is Empty Or Not

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In bash shell, you can check if a variable is empty or not using the following syntax:

if [ -z "$VARIABLE_NAME" ]; then
echo "Variable is empty"
else
echo "Variable is not empty"
fi

The -z operator checks if the length of the string stored in the $VARIABLE_NAME is zero, indicating that the variable is empty. If the length is non-zero, the if statement will evaluate to false and the code inside the else block will be executed.

You can also check if a variable is not empty using the following syntax:

if [ -n "$VARIABLE_NAME" ]; then
echo "Variable is not empty"
else
echo "Variable is empty"
fi

The -n operator checks if the length of the string stored in the $VARIABLE_NAME is non-zero, indicating that the variable is not empty. If the length is zero, the if statement will evaluate to false and the code inside the else block will be executed.

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