restorevol: 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/restorevol - from package: openafs-client

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

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