stdair: 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 - from package: stdair

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

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