openscada: 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/openscada - from package: openscada

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

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