47 bytes plus three for the flags: perl -lnF script.pl
/#+/;{unshift@F,pop@F;++$i<"$$'"&&redo}print@F  Explanation: • -lnF reads the input, removes the trailing newline, splits up the remainder into characters, and puts that split into the array @F. • $"='' makes sure that when we stringify an array it has no spaces in it.
• /#+/ finds #s in the input string and sets $ equal to the stuff before it and $' equal to the stuff after it. $'$ is thus the number of times to rotate the array.
• Now comes a loop: We increment $i (which starts at 0) and test against $'$ (the number of times to rotate); if we haven't reached $'\$ yet, we redo the loop. What does the loop do? Simple: it rotates the array (pops the last element and unshift`s it onto the beginning).