check if string is empty bash code example

Example 1: bash if null or empty

if [ -z "$variable" ];
  then echo "$variable is null";
  else echo "$variable is not null";
fi

Example 2: bash check if variable is empty

if [ -z "$var" ] #return true if $var is unset

Example 3: bash script check empty string

if [ -z "$var" ]
then
      echo "\$var is empty"
else
      echo "\$var is NOT empty"
fi