cde: 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/cde - from package: cde

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

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