sdatest: 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/sdatest - from package: ion

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

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