ibaddr: 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/sbin/ibaddr - from package: infiniband-diags

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

On Debian possible default full paths are:

/usr/sbin/ibaddr - from package: infiniband-diags

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

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