cjet: 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/bin/cjet - from package: cjet

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

On Debian possible default full paths are:

/usr/bin/cjet - from package: printer-driver-cjet

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

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