rjoe: 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/rjoe - from package: joe

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

On Debian possible default full paths are:

/usr/bin/rjoe - from package: joe-jupp
/usr/bin/rjoe - from package: joe

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

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