yagv: 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/yagv - from package: yagv

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

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