cdpause: 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/cdpause - from package: cdtool

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

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