iodbctestw: 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/iodbctestw - from package: libiodbc

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

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