Return 'ok' to match the spec; os:cmd/1 returns string()
Return 'ok' to match the spec; os:cmd/1 returns string()

mwilliams3/disco,seabirdzh/disco,oldmantaiter/disco,beni55/disco,mozilla/disco,pombredanne/disco,discoproject/disco,ErikDubbelboer/disco,ErikDubbelboer/disco,beni55/disco,scrapinghub/disco,pavlobaron/disco_playground,pombredanne/disco,oldmantaiter/disco,seabirdzh/disco,simudream/disco,mwilliams3/disco,oldmantaiter/disco,ErikDubbelboer/disco,beni55/disco,scrapinghub/disco,scrapinghub/disco,scrapinghub/disco,seabirdzh/disco,ErikDubbelboer/disco,pombredanne/disco,mwilliams3/disco,beni55/disco,beni55/disco,simudream/disco,discoproject/disco,simudream/disco,pooya/disco,ktkt2009/disco,oldmantaiter/disco,pombredanne/disco,seabirdzh/disco,mozilla/disco,simudream/disco,mwilliams3/disco,pavlobaron/disco_playground,discoproject/disco,ErikDubbelboer/disco,pombredanne/disco,pooya/disco,oldmantaiter/disco,seabirdzh/disco,pooya/disco,simudream/disco,mozilla/disco,discoproject/disco,mwilliams3/disco,ktkt2009/disco,discoproject/disco,ktkt2009/disco,pavlobaron/disco_playground,pooya/disco,mozilla/disco,ktkt2009/disco,pavlobaron/disco_playground,ktkt2009/disco