cdfmhst: 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/cdfmhst - from package: cdftools

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

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