bash check if variable is empty

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

4
10

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

4 (10 Votes)
0
0
0
Eric Kao 100 points

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

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