yaggo: 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/yaggo - from package: yaggo

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

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