gjay: 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/gjay - from package: gjay

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

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