sdop: 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/sdop - from package: sdop

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

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