I use awk a lot combined with grep, cat, ls, find, etc.
Once I wrote a program in awk to parse a binary file, it was easier an run faster than use a program language. I was impressed.
And like others I think the list has several basic commands, not just sysadmin commands.
ssh, scp, sftp
find (it's basic, but it has advanced iptions)
Install and manage software
Good idea, bad implementation. I agree with the comments about including more countries. I am from Mexico and I see there isn't any Latin American country. I hope you consider our comments for coming contests.