stdair-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/stdair-config - from package: stdair-devel

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

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