devio: 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/devio - from package: devio

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

On Debian possible default full paths are:

/usr/bin/devio - from package: devio

You may install the required package with command apt-get install {package}

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