spek: 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/spek - from package: spek

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