There is a shell script in the same folder as this php file. In a single argument of your script you receive a path to a file. It is a gzipped text file. Somewhere inside it there is a following block:

<passwd=somepassword>
where somepassword is the line you need to find. Complete the shell script so it outputs this password (and nothing else, there should not be even a newline at the end)

Script output is 'Complete me! '