display-dhammapada: 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/display-dhammapada - from package: display-dhammapada

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

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