pymissile-movetointercept: 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/pymissile-movetointercept - from package: pymissile

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