ipmaddr: 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:

/sbin/ipmaddr - from package: net-tools

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

On Debian possible default full paths are:

/sbin/ipmaddr - from package: net-tools

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

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