bash - [: -gt: unary operator expected -

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I do not write too many bashs, so I'm a little bit stumped about how to fix it. I need to check that the value returned by a command is greater than x when it runs, I get the [: -gt: unary operator required which is I'm unable to fix

This is my script, 

  #! / Bin / sh Error = 0 PHPCPDLevel = 100 # PHPCPD "PHP CopyPaste Test (at least $ {PHPCPDLevel}%" PHPCPD = "phpcpd" if echo "[$ PHPCPD echo. Grep"% "| Cut-D ' -f1` -gt "$ PHPCPDLevel"]] Then $ PHPCPD ERROR = 1 else resonates "... - & gt; Only $ PHPCPD | grep"% "| Cut-D" resonates. "-f1 % "Fix buzz" is over! "Exit $ ERROR   
  Update:  I think I did it:  
 PHP code = "PHPCPDLevel = 25 # PHPCPD resonance" PHP CopyPaste probe (limit maximum $ {PHPCPDLevel}%) "PHPCPD =" phpcpd. "PERCENTAGE = $ ($ PHPCPD | grep"% "| Cut-d '. -f1) if [$ {PERCENTAGE} -gt $ $ PHPCPDLevel}] Then $ PHPCPD ERROR = 1 echo resumes "EF $ EXCEPT"% ERROR exit    
 
 
 Remember that  [ is an order.It is built in your shell, but it is still expecting a specific set of command parameters , And when you get something that you do not understand then give you an error. In fact, you can replace  [...]  to  test ... , if it makes it easy to understand:  
 For example:  
  test-gt 34 ​​  
 will return:  
  bash: test: - Gt: unary operator required   
 Hmmm ... same error message.  
 When you receive things like this, you should see  set -xv  and  set + Xv  around the problem area of ​​your shell script in the  Set -xv  will execute the shell command to execute, and then show you how the command line looks like  glitch  I mean  interpolated         
 / Pre> 
 That  $ {PERCENTAGE}  is an empty value if you use  [...]  instead of  [[...]]  If you do not get the error then  [[...]]  is parsed slightly differently from  [...]  because it is a short command initial Shell interpolation is done after the command is parsed, so if you miss a quotation mark or string contains unexpected characters then it is a little more forgiving. PHPCPDLevel = 25 # PHPCPD "PHP CopyPaste Detection (limit $ {PHPCPDLevel}% is maximum") "Export PS4 =" \ $ LINENO: "#by debug set-xv # Line number is executed, debugging turned on PHPCPD = "phpcpd." PERCENTAGE = $ ($ PHPCPD | grep "%" | cut-d '.' -f1) if [[$ {PERCENTAGE} -gt $ {PHPCPDLevel }] Instead of using [[...]] instead of $ PHPCPD error = 1 echo resumes "only $ PERCENTAGE%" Fi set + xv # Exit exit debugging $ ERROR   
 Now, you will see that the various commands set are returning the environment variable And, potentially, you can see something that you did not expect.

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