ior-decode-2: 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/ior-decode-2 - from package: ORBit2-devel

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

On Debian possible default full paths are:

/usr/bin/ior-decode-2 - from package: orbit2

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

Error in other languages:
ior-decode-2: bevel nie gevind nie
ior-decode-2: comandă negăsită
ior-decode-2: comando não encontrado
ior-decode-2: commande introuvable
ior-decode-2: command not found
ior-decode-2: käsku ei ole
ior-decode-2: không tìm thấy lệnh
ior-decode-2: komanda nerasta
ior-decode-2: Kommando nicht gefunden.
ior-decode-2: kommandot finns inte
ior-decode-2: komut yok
ior-decode-2: nie znaleziono polecenia
ior-decode-2: níor aimsíodh an t-ordú
ior-decode-2: no se encontró la orden
ior-decode-2: no s'ha trobat l'ordre
ior-decode-2: opdracht niet gevonden
ior-decode-2: parancs nem található
ior-decode-2: perintah tidak ditemukan
ior-decode-2: príkaz nenájdený
ior-decode-2: příkaz nenalezen
ior-decode-2: команда не найдена
ior-decode-2: командата не е открита
ior-decode-2: 命令找不到
ior-decode-2: コマンドが見つかりません