cjdnsa: 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/cjdnsa - from package: cjdns-python

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

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