yasat: 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/yasat - from package: yasat

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

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