boolean &cat(
string
$args)
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		Concatenate files
Usage:  1) $var = System::cat('sample.txt test.txt');  2) System::cat('sample.txt test.txt > final.txt');  3) System::cat('sample.txt test.txt >> final.txt');
Note: as the class use fopen, urls should work also (test that)
        Parameters:
    
        
   
  
    
	
		The "find" command
Usage:
System::find($dir);  System::find("$dir -type d");  System::find("$dir -type f");  System::find("$dir -name *.php");  System::find("$dir -name *.php -name *.htm*");  System::find("$dir -maxdepth 1");
Params implmented:  $dir            -> Start the search at this directory  -type d         -> return only directories  -type f         -> return only files  -maxdepth <n>   -> max depth of recursion  -name <pattern> -> search pattern (bash style). Multiple -name param allowed
        Parameters:
    
        
   
  
    
    
		mixed mktemp(
[string
$args = null])
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		Creates temporary files or directories. This function will remove  the created files when the scripts finish its execution.
Usage:    1) $tempfile = System::mktemp("prefix");    2) $tempdir  = System::mktemp("-d prefix");    3) $tempfile = System::mktemp();    4) $tempfile = System::mktemp("-t /var/tmp prefix");
prefix -> The string that will be prepended to the temp name            (defaults to "tmp").  -d     -> A temporary dir will be created instead of a file.  -t     -> The target dir where the temporary (file|dir) will be created. If            this param is missing by default the env vars TMP on Windows or            TMPDIR in Unix will be used. If these vars are also missing            c:\windows\temp or /tmp will be used.
        Parameters:
    
        
   
  
    
	
		Get the path of the temporal directory set in the system  by looking in its environments variables.
Note: php.ini-recommended removes the "E" from the variables_order setting,  making unavaible the $_ENV array, that s why we do tests with _ENV