marc: 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 CentOS possible default full paths are:

/usr/bin/marc - from package: arc

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/marc - from package: arc

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

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