Spelling mistake "commadn"

[goodking-gk]

Issue Description

Type: bug report(Spelling mistake)

Describe what happened (or what feature you want)

cli/cmd/check_os.go, line 295, the wrong spelling of "command"

Describe what you expected to happen

How to reproduce it (as minimally and precisely as possible)

Tell us your environment

Anything else we need to know?

[xcaspar]

Thank you, can you submit a pr to fix it?

[Super-long]

I fixed it in #710.