sagasu: 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/sagasu - from package: sagasu

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

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