cupsdisable: 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/cupsdisable - from package: cups

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

On Debian possible default full paths are:

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

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

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