cdclose: 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/cdclose - from package: cdtool

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

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