ricci: command not found

Have You tried accessing the binary with the full path?

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/sbin/ricci - from package: ricci

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