/Shell/Bash/Bash check if variable is empty

Bash check if variable is empty

Bash if null or empty

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

13

Bash if variable is not empty

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

5

Bash check if variable is empty

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

2

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