bash check empty string code example

Example 1: bash check if variable is empty

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

Example 2: bash script check empty string

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

Example 3: shell cehck if string is null

my_var="nixCraft"
if [ -z "$my_var" ]
then
      echo "\$my_var is NULL"
else
      echo "\$my_var is NOT NULL"
fi

// https://www.cyberciti.biz/faq/bash-shell-find-out-if-a-variable-has-null-value-or-not/

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