grabc: 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/grabc - from package: grabc

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

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