What does -z mean in Bash

Question

I m looking at the following code     if   -z  2    then         echo  usage         The 3 dots are irrelevant usage details   Maybe I m googling it wrong  but I couldn t find an explanation for the -z option

User · Answer

test -z returns true if the parameter is empty  see man sh or man test

User · Answer

The expression -z string is true if the length of string is zero

User · Answer

-z  string is null  that is  has zero length  String        Zero-length   null   string variable   if   -z   String    then   echo    String is null   else   echo    String is NOT null   fi        String is null

User · Answer

-z string   True if the string is null  an empty string

[bash] What does -z mean in Bash?

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