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16.3.4 String tests

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 not equal.