grace: 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/grace - from package: grace

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

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