scanssh: command not found

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/scanssh - from package: scanssh

You may install the required package with command apt-get install {package}

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