king: 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/king - from package: king

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

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