marc2dc: 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/marc2dc - from package: libmarc-crosswalk-dublincore-perl

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

Error in other languages:
marc2dc: bevel nie gevind nie
marc2dc: comandă negăsită
marc2dc: comando não encontrado
marc2dc: commande introuvable
marc2dc: command not found
marc2dc: käsku ei ole
marc2dc: không tìm thấy lệnh
marc2dc: komanda nerasta
marc2dc: Kommando nicht gefunden.
marc2dc: kommandot finns inte
marc2dc: komut yok
marc2dc: nie znaleziono polecenia
marc2dc: níor aimsíodh an t-ordú
marc2dc: no se encontró la orden
marc2dc: no s'ha trobat l'ordre
marc2dc: opdracht niet gevonden
marc2dc: parancs nem található
marc2dc: perintah tidak ditemukan
marc2dc: príkaz nenájdený
marc2dc: příkaz nenalezen
marc2dc: команда не найдена
marc2dc: командата не е открита
marc2dc: 命令找不到
marc2dc: コマンドが見つかりません