udaddy: 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/udaddy - from package: librdmacm-utils

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

On Debian possible default full paths are:

/usr/bin/udaddy - from package: rdmacm-utils

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

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