$ valgrind ./nmap --proxies socks4a://127.0.0.1:9050 --script http-title scanme.nmap.org -p 80 -Pn
==22866== Memcheck, a memory error detector
==22866== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==22866== Using Valgrind-3.10.0 and LibVEX; rerun with -h for copyright info
==22866== Command: ./nmap --proxies socks4a://127.0.0.1:9050 --script http-title scanme.nmap.org -p 80 -Pn
==22866== 

Starting Nmap 6.49SVN ( https://nmap.org ) at 2015-08-21 04:33 PDT
Nmap scan report for scanme.nmap.org (45.33.32.156)
Host is up (0.024s latency).
Other addresses for scanme.nmap.org (not scanned): 2600:3c01::f03c:91ff:fe18:bb2f
PORT   STATE SERVICE
80/tcp open  http
|_http-title: Go ahead and ScanMe!

Nmap done: 1 IP address (1 host up) scanned in 12.92 seconds
==22866== 
==22866== HEAP SUMMARY:
==22866==     in use at exit: 1,255,306 bytes in 3,093 blocks
==22866==   total heap usage: 349,427 allocs, 346,334 frees, 47,861,219 bytes allocated
==22866== 
==22866== LEAK SUMMARY:
==22866==    definitely lost: 0 bytes in 0 blocks
==22866==    indirectly lost: 0 bytes in 0 blocks
==22866==      possibly lost: 0 bytes in 0 blocks
==22866==    still reachable: 1,255,306 bytes in 3,093 blocks
==22866==         suppressed: 0 bytes in 0 blocks
==22866== Rerun with --leak-check=full to see details of leaked memory
==22866== 
==22866== For counts of detected and suppressed errors, rerun with: -v
==22866== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
$