sdsdump: 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/sdsdump - from package: simh

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

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