rvc: 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/rvc - from package: vtgrab

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

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