Quoting  holmes072000@charter.net:

>  From: "Gnanavel" <gnanavel_online@[...].com>
>  
>  
>  > I have problem in executing  linux command
>  >
>  > $output=exec("ls -a");
>  > echo "<pre>$output</pre>";
>  >
>  > the above coding works, but
>  >
>  > $output=exec("cp file1 file2");
>  > echo "<pre>$output</pre>";
>  >
>  > does not works. can any one help me out of this problem
>  
>  Riddle me this... exec() returns the last line of output from the result
>  of
>  the command. What is the last line of output when you run "cp file1
>  file2"
>  from the command line?
>  
>  ---John Holmes...
>  
>  

When I was executing the "cp" command it doesn't return anything. 
But it returned the name of the last file when i executed the "ls" command

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