Shell script variable not empty -z option

Question

How to make sure a variable is not empty with the -z option    errorstatus  notnull  if    -z  errorstatus   then    echo  string is not null  fi   It returns the error      test  line 2      -z  unary operator expected

User · Answer

I think this is the syntax you are looking for   if   -z     errorstatus    then commands else commands fi

User · Answer

Of course it does  After replacing the variable  it reads    -z    which is not a valid   command  Use double quotes  or      if     -z   errorstatus     if      -z  errorstatus

User · Answer

Why would you use -z   To test if a string is non-empty  you typically use -n    if test -n   errorstatus   then   echo errorstatus is not empty fi

[shell] Shell script variable not empty (-z option)

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