cjdns-online: 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/cjdns-online - from package: cjdns

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

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