Check If String Is Not 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 if variable is not empty

VAR=`echo Hello world` if [[ -n "$VAR" ]] ; then echo "Variable is set" ; fi

Example 3: bash check if variable is empty

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

Example 4: bash script check empty string

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