snscan: 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

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/sbin/snscan - from package: sn

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