grml2iso: 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/sbin/grml2iso - from package: grml2usb

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

Error in other languages:
grml2iso: bevel nie gevind nie
grml2iso: comandă negăsită
grml2iso: comando não encontrado
grml2iso: commande introuvable
grml2iso: command not found
grml2iso: käsku ei ole
grml2iso: không tìm thấy lệnh
grml2iso: komanda nerasta
grml2iso: Kommando nicht gefunden.
grml2iso: kommandot finns inte
grml2iso: komut yok
grml2iso: nie znaleziono polecenia
grml2iso: níor aimsíodh an t-ordú
grml2iso: no se encontró la orden
grml2iso: no s'ha trobat l'ordre
grml2iso: opdracht niet gevonden
grml2iso: parancs nem található
grml2iso: perintah tidak ditemukan
grml2iso: príkaz nenájdený
grml2iso: příkaz nenalezen
grml2iso: команда не найдена
grml2iso: командата не е открита
grml2iso: 命令找不到
grml2iso: コマンドが見つかりません