cdfrmsssh: 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/cdfrmsssh - from package: cdftools

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

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