airrac-config: 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/airrac-config - from package: airrac-devel

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

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