ethstatus: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/ethstatus - from package: ethstatus

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/ethstatus - from package: ethstatus

You may install the required package with command apt-get install {package}

Error in other languages:
ethstatus: bevel nie gevind nie
ethstatus: comandă negăsită
ethstatus: comando não encontrado
ethstatus: commande introuvable
ethstatus: command not found
ethstatus: käsku ei ole
ethstatus: không tìm thấy lệnh
ethstatus: komanda nerasta
ethstatus: Kommando nicht gefunden.
ethstatus: kommandot finns inte
ethstatus: komut yok
ethstatus: nie znaleziono polecenia
ethstatus: níor aimsíodh an t-ordú
ethstatus: no se encontró la orden
ethstatus: no s'ha trobat l'ordre
ethstatus: opdracht niet gevonden
ethstatus: parancs nem található
ethstatus: perintah tidak ditemukan
ethstatus: príkaz nenájdený
ethstatus: příkaz nenalezen
ethstatus: команда не найдена
ethstatus: командата не е открита
ethstatus: 命令找不到
ethstatus: コマンドが見つかりません