cupsenable: 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 CentOS possible default full paths are:

/usr/sbin/cupsenable - from package: cups

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/sbin/cupsenable - from package: cups-client

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

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