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These options test string characteristics. You may need to quote
string arguments for the shell. For example:
test -n "$V"
The quotes here prevent the wrong arguments from being passed to
test if ‘$V’ is empty or contains special characters.
-z string’
True if the length of string is zero.
-n string’string’
True if the length of string is nonzero.
string1 = string2’
True if the strings are equal.
string1 == string2’
True if the strings are equal (synonym for =).
string1 != string2’
True if the strings are not equal.