grfcodec: 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/grfcodec - from package: grfcodec

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

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