isenkram-lookup: 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/isenkram-lookup - from package: isenkram-cli

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

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