spd: command not found

Have You tried accessing the binary with the full path?

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/spd - from package: spd

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