zenlisp: 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/zenlisp - from package: zenlisp

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

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