gethost: 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 Debian possible default full paths are:

/usr/bin/gethost - from package: dmucs

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

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