http://username:password@proxyhost:port/

http_proxy=http://john:TheSecret123@my.proxy:8123/

johan@Komputer:~$ sudo cntlm -IM http://test.com
Password:
Config profile  1/4... OK (HTTP code: 200)
----------------------------[ Profile  0 ]------
Auth            NTLMv2
PassNTLMv2      A12B34C56D78E90A12B34C56D78E90A1

vim /etc/proxychains.conf

#socks4         127.0.0.1 9050
socks5          127.0.0.1 1080

proxychains steam