marc2ris: 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/marc2ris - from package: refdb-clients

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

Error in other languages:
marc2ris: bevel nie gevind nie
marc2ris: comandă negăsită
marc2ris: comando não encontrado
marc2ris: commande introuvable
marc2ris: command not found
marc2ris: käsku ei ole
marc2ris: không tìm thấy lệnh
marc2ris: komanda nerasta
marc2ris: Kommando nicht gefunden.
marc2ris: kommandot finns inte
marc2ris: komut yok
marc2ris: nie znaleziono polecenia
marc2ris: níor aimsíodh an t-ordú
marc2ris: no se encontró la orden
marc2ris: no s'ha trobat l'ordre
marc2ris: opdracht niet gevonden
marc2ris: parancs nem található
marc2ris: perintah tidak ditemukan
marc2ris: príkaz nenájdený
marc2ris: příkaz nenalezen
marc2ris: команда не найдена
marc2ris: командата не е открита
marc2ris: 命令找不到
marc2ris: コマンドが見つかりません