ro: 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:

/var/spool/hylafax/bin/dict/ro - from package: hylafax+

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