Netcracker Technology Devops Engineer interview questions

It was very different. First shot I had Recruiter, Technical (was good), Managerial (was good), HR (right at the schedule, I waited for 20 minutes, she entered and rescheduled and then got 20 min later) and then a director refused me, she/he questioned why did I work on 4 companies in 5 years and also why didn't I put MY WHOLE CARRER SINCE 2009 on my CV (they're really concerned about you entire life working on MCDonalds). The recruiter found another area that was interested on me thus, second shot. Terrible, both of the interviewers were like distrusting me. They were acting as if I were a lier, making questions like: "here says you know linux but you don't know this command (a small smile in his face)?". Intimidating me. Making questions like: what's the command to list files, whats the command to monitor a cpu, is it a certification test or an interview ?