????host and dig: ????DNS
????lsof: ?????????????????socket???
????dstat: ???????????????????
????iostat: CPU???????????
????htop: top?????汾
????last: ??????
????w: ?????????
????id: ?????/?? ??????
????sar: ?????????????????
????iftop or nethogs: ??socket??????????????????
????ss: ????????
????dmesg: ????????????????
????(Linux) hdparm: ??????趨???????
????(Linux) lsb_release: ??linux?????а汾???
????(Linux) lshw: ????????
????fortune?? ddate?? and sl: ?????????????????????????????????á?