spydr: 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/spydr - from package: yorick-spydr

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